Malicious PDF — malware analysis report

Static analysis result for SHA-256 0554b6edc779caf2…

MALICIOUS

PDF

87.2 KB Created: 2021-06-30 22:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2056efce05c975088471e7bbb45b643a SHA-1: 202a96ae455388e4a30f07581a6293e5a04026e5 SHA-256: 0554b6edc779caf2324c387024fe16b022d11dbe1f68f6cc29e61b889ec3e5cc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, likely to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a fraudulent phone number, consistent with tech-support scams or callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/hjakfqgmfhq4e9rend9gtd4fb7/radazovaru.pdf In PDF document text
    • http://bebelino.ru/userfiles/file/29757048415.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/lomexofaremakesozi.pdfIn PDF document text
    • http://dhf-china.com/d/files/senasabupaxelunuxemu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160775a3368c61---rufafujibixabumaxunemuxa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609678e765264---tuzoropovigajabimit.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/66367030292.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53c287c9d---35989312785.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/86183903143.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/20ccbbd42dc58564e9a3a23300421329/74905011295.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/968d2fbba457abd030339c177ee4a1a5/83461464290.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/felimeme.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a91b9a7859f59a4bb68e040b3f7142d5/kobideperoruxepaxeremutaj.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a014ecab3---nugizixagubisuxozoj.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bfb6e9718801c7d7b19d0529a1bdc2bc/sovewazojez.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c9b72d06---89489150669.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01ee9bd418---84736849402.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c51b32e28e4---puvinavo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608002209ed8a---4450092370.pdfIn PDF document text
    • https://stopserv.ru/files/file/wajirus.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4b4fae9e8034c0afabbaaa2a21fd6497/66987919389.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dafcbb35bf5---34549213392.pdfIn PDF document text
    • http://195exim.com/datas/files/43820432573.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6abd769be---towelutotepomagexapanut.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/29303184496.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0270227e72---32702080358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=where+to+write+for+mobile+deposit+only+on+checkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 17812 bytes
SHA-256: 20ff9a44ee73c08a389ef1b55c5066e48b6c508d083b0c604fdf782eea5a6414
font_01_sfnt_off00011d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 11148 bytes
SHA-256: a16470e9b919add0685d94a96d38259fe3cf0effe51840afd31b2f1ab9a57732
font_02_sfnt_off0001370d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.