Malicious PDF — malware analysis report

Static analysis result for SHA-256 123744f93b6b9e43…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 16:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97701fc654ff489d044abba0064d976d SHA-1: 0a4c60e65b58240097887e2ff695daeb032f2b02 SHA-256: 123744f93b6b9e437c158b78b3c885daa40d424f52ef8a04bb6891ca55847460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm hosted on compromised CMS uploads, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/dvlrht7en1lngv5t1bendh4ce1/kenofug.pdf In PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/d1ee3f1d42b7ad99c5ab2b0dd39bb39a/66486283485.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd2a41e966---21278662035.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fr72g048pmilj6r56osd49treq/47470822456.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5b176ad0a90efd7d7cf190ef7337d181/78934571523.pdfIn PDF document text
    • http://xtra360.net/campannas/file/bevulakupodufepedi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610eed308ba22---javuvikugadimut.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/becd09c19afa4a3828460f841e2d24fc/47814062065.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/nakaxe.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/93722086213.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c7ab2813d---xibavukokomesegonoj.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/42053049996.pdfIn PDF document text
    • http://bscartridge.com/pic/kesevali.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d019a500de---54272687071.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/58547136402.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/3bd314b4564b95ce7c33400f0be10e20/88262775996.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078df52c8b31---ruxepamapozapudazalasuz.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/n718qje3ebbq87ub45dg87i2m2/41681123398.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607652bf52434---8519541716.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/voretelemazufapexexok.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/vexitopagag.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/jufejusab.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/xeberuxuxegel.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/2172746592.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c092fbad03d---wigejimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tecnica+de+pinzamiento+del+cordon+umbilical+pdfPDF 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_off0000cd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 18036 bytes
SHA-256: 8983a6fab662f7229290e91961d9cef39e763a103a79b34f5ad0be328e941029
font_02_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 10876 bytes
SHA-256: 49e555a83ceab4ae49961dc52906e2128ede46d8ff5a7614e7fdc96dbd96f46e