Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4866f8c97a7d70…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 18:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 857431310eb951c730c91d377165e73c SHA-1: 1e15e4c5dc9941748922fc59b5b4f62a7af292e1 SHA-256: ec4866f8c97a7d705e52f9fbbf2835495aed42cfc14965d80a47826b3f968c4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=speaking+english+practice+pdf PDF link annotation
    • http://omak1968.com/clients/71178/File/vipivezatoworilomuroxuj.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5f7491ba---43887842643.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/83768408361.pdfIn PDF document text
    • https://arerp.kr/data/file///rudowojutizuga.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160944cacc35f3---43274673732.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835863d849d---60748556425.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/84102133897.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/bipezepizawipuvowu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b3a161cd62e5cc68096b73a31460f997/87899728532.pdfIn PDF document text
    • http://llux.vn/uploads/files/94721645416.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/vivoju.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/55970215149.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/fabivapefogatolugoxipax.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/53567118188.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e528689c8---zokadepofudokiziwafup.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/vazugoritululiwetupa.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/371407d8acd802d3093b2fabba70264b/kubagorurozovexawunojer.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/razevaw.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a1896260c124776eebb794f46327ff87/48791763510.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/89123330312.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/nijepemumitimuni.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/930591239a36ff527e2456339692b11c/pefulubomuxa.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac972e8e858---70719582451.pdfIn PDF document text
    • 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_off0000c369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 10948 bytes
SHA-256: 351ae45ea1c3fb5782cf450a6f58cea7018b1f8972bd872fd82117a97beef933
font_02_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 16752 bytes
SHA-256: e8a6d2a4f5764a104fb93d12ba928e0cdc6d720df1372c3f94ed1e80c5906155

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