Malicious PDF — malware analysis report

Static analysis result for SHA-256 1691f1e7984e27bd…

MALICIOUS

PDF

93.5 KB Created: 2021-07-13 22:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb25d179cfa5a654efdce17e8ca391b8 SHA-1: c49c25d1e2f3703b7bfc5f80979be52c412e756e SHA-256: 1691f1e7984e27bd60a117855ef4f47842d41612d4152fc065b0d8b290f0c99c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging a PDF exploit or social engineering to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://garglob.ru/uplcv?utm_term=wow+classic+hunter+levelling
    • http://mlsy.cz/images/file/files/bowige.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf74186a2---megibamapibawag.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1093d0f1572f034f791edfb9e8f9331d/50002569812.pdf
    • http://verypool.cn/images/upload/File/86495728384.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/50qjltl1ducp6hkqlktec0aml4/vexijifaseniv.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba95d9d5f83---jumasusodabifun.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4f8c2818b---vabokolemofozuridoba.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/kibinakofevadikidaxun.pdf
    • http://szentimresiklos.hu/upload/file/nefekuzijaw.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b6d7d8e626a9471f432a4fe8016928fd/vigubafonufezuxezoparig.pdf
    • http://sonsuadogo.org/Images_upload/files/52594221040.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef53d79c16---xovenibikifaxaral.pdf
    • http://www.asap-recruitment.net/upload/file/sexiputu.pdf
    • http://ash-graphy.com/userfiles/file/17933395829.pdf
    • http://club-integra.ru/userfiles/file/zirelifixuwower.pdf
    • https://greffedecheveux.center/upload/ckfinder/files/fevabadamaxeboteg.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-28/20210428232236911385.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210604_EC44EECFE1541F3D.pdf
    • http://kimyasaldubeller.com/upload/ckfinder/files/77052849916.pdf
    • http://jjinline.org/file_upload/file/69196996769.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d8dc155b7cb8cbc3be2a4836f49ae8d1/kasikelajegavedi.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/940i7358sp4p658mj5krrnoq0s/jutamatorarajebalez.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b2f.bin
ca640cd5a0cc6440c7ed7f5c38740f57b1d1575bff8987ea8a0806bc85727bed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 10756 bytes
font_01_sfnt_off000123f5.bin
94654c41dbcae23c9a99f83a7f7ea508472f14e451340a81d40d3d2877a46939
pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 17096 bytes
font_02_sfnt_off000150bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x150BB 16792 bytes