Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce62996cd6456b2…

MALICIOUS

PDF

91.4 KB Created: 2021-09-06 19:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78ea3550a276d6296559873fa3b69fc7 SHA-1: afb8ab4612884400d892025ae97e3521338f7b6b SHA-256: 5ce62996cd6456b27fada4e82869c4e5d5017823371f62511ba54f14f1afee72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such hosting for link farms, often associated with SEO poisoning or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://laborke.ru/uplcv?utm_term=fuentes+de+variacion+genetica+pdf PDF link annotation
    • https://espiber.cl/images/uploadedimages/file/tudegogiminulon.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/pavudazedo.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/fexubaj.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/39535092236.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/35428406928.pdfIn PDF document text
    • http://househouse.it/userfiles/files/sewodenunewesede.pdfIn PDF document text
    • https://go2germany.ru/files/file/mafebabes.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a949e6e8370---virawe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce181a10feb---61805336200.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/mafojora.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c6c82b4c359d9cddf2c513d45c062437/47345148645.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/zuxodikezokogisilebuz.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607496d1d0e57---74333859238.pdfIn PDF document text
    • https://grandegroup.net/files/vezulawixerakokute.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210830_143251.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/74942394962.pdfIn PDF document text
    • https://emmaushuis.org/pages/35234405291.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/6nhsedloj850lbda59fc0es575/16603050610.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/57519117653.pdfIn PDF document text
    • http://hotstamping.pl/files/file/rijobesofek.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/47756716430.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/7927702631.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00aaf8687e---258632439.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/70038753358.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607992c27ca51---23447422828.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_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 18592 bytes
SHA-256: f51b24fcec85fcdd61c77864862a7f9d968c6df0e99dc67f9afacfbe257474cb
font_02_sfnt_off000146ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AB 10892 bytes
SHA-256: 10984b1d074e25d2eab9e0017e932ada8cbe68978e9814eaa3efb2336c3d08cc

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