Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42c7bd3c23aae32…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 13:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08169fa009d1bbbcc05a734410feba26 SHA-1: c00f4ef74175d0126e8d7387e18084ccf95e3902 SHA-256: f42c7bd3c23aae32558b2cf880a1360b9b5f9168a63027a8c71b46644b27fa29
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cheniou.handysociality.com/upload/files/16061585763.pdf In PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/febaz.pdfIn PDF document text
    • http://schokofontaene.de/idata/nomufijidiluxofowi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/2c9045a28e6034ac7842e9b968623009/bakofiwa.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/41436710703.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/9064424679.pdfIn PDF document text
    • http://freewest.at/muwegodepebotobazikuwot.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139b722974---38454675257.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/zenoz.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0hs1jlbj2c6jboj306ii13m863/danav.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/xabuvojob.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/40423549752.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/gepep.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/dumokatobina.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/vofutegekikiwojobofezor.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/74497181972.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/xewibumetumuxejeg.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/joselefebeni.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/jerufivipufavamokipibuluj.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/82985469746.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/nowizixaketosogimetufok.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/28520612987.pdfIn PDF document text
    • http://qwerty.pl/_data/file/5028740841.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/s5i0pcoeg0o4ar5a0pcdq34u39/2955277804.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/98285540051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pinched+nerve+in+left+arm+symptomsPDF 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_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 11068 bytes
SHA-256: 9a241ea0a9e122e53edf1a5a7cab0b441ad2cde16febb6f05a569e35e71a5f9d
font_02_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 16640 bytes
SHA-256: 994a93f4e397e7588e725ae0cee14ab67321235139a2c22195984d8b446d115e