Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88bf243b418befc…

MALICIOUS

PDF

86.3 KB Created: 2021-09-23 23:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 630971d0242a2706c0a725de41693458 SHA-1: 52f52b3561afbb7f7c2b3e051068fb7f8f4cb55e SHA-256: f88bf243b418befcdca526307f16308fc33b5fadf4896c4132355b58c2090d0f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the 'callback lure' heuristic suggest an attempt to trick the user into interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://s-h.cc/uploads/files/202109170226178382.pdf In PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/753868c9f8fcca363e7752871f8c17cb/73722772415.pdfIn PDF document text
    • https://csn-alliance.com/data/files/94104866646.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/59754221558.pdfIn PDF document text
    • https://fond.ru/userfiles/file/begipab.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/35341854001.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/9990486763.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/26724367612.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/77336057504.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/movej.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210914105343.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135caddb2975---vujuxunodugewunux.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/vetafiserazawonepabag.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134e64035911---kodogazetudu.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/bagilatemidopepofi.pdfIn PDF document text
    • http://toroisg.com/public/images/files/72552293754.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/21554363366.pdfIn PDF document text
    • http://builderall.info/userfiles/file/14016920470.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/17703331338.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/geweja.pdfIn PDF document text
    • http://gibisch.com/files/files/juvufigovavo.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/14168778089.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/69924823638.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/retobod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=5+lines+short+stories+with+moral+in+english+for+competitionPDF 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_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 17844 bytes
SHA-256: be989eb3b11f76824a7f41eb90a04fea01a950ba9014935bb312ab2733c63249
font_01_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13174 11048 bytes
SHA-256: f02e1cd57a9243cb33d61e3fc20f04f76767c68429f076b7b43181b37f925838

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