Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7b61b9b7544ce2…

MALICIOUS

PDF

83.2 KB Created: 2021-08-26 00:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ac93af27eeca45bb2a1743333ac3118 SHA-1: 216634c203d61ae87efcc61223bb7cf6c2a63de2 SHA-256: 3e7b61b9b7544ce2f81d17444707053f524053374dcc0eb80fbf77c42dd7aaf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and link farm heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609432aab7a15---subakinoripe.pdf In PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/88488851077.pdfIn PDF document text
    • https://aedwea.com/upload/foto/topoletivodidapaguk.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/zuxutozaluwuzukoxukagu.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/disijegosajareza.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6081bc5aa5e463accb531ff873f0e5b4/98359487525.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123af212c7a1---dokesaxekugurowikepeve.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/56917478515.pdfIn PDF document text
    • https://lasanisports.com/files/kozadubefabuvoxakibitem.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/pezinasezegi.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5206c9ca---44239081649.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/zivelegexokidixuxeler.pdfIn PDF document text
    • https://chp-travel.ir/data/file/vagedetedemujuzovemi.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/20d0fc7176853b3918e0903af4b4dd5e/lefosunonosixoxin.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa855c49de---14291963736.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f8de84b9---35481292936.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/89092553134.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/45323345701.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d2a25882---9344506811.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/fupudigef.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820c0144ad7---newobigowosuril.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/42401676577.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/67980865224.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tulorudenumejumobewumezu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4ea8e600---tisaloxasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=two+birds+in+the+handPDF 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_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 15816 bytes
SHA-256: 295f099e329fb16ca82fea6b051909a3efd172543eccfa30bf945488eff58853
font_01_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12687 10488 bytes
SHA-256: 3beb02a35683edc4ad1e886a2b6c530f5b9201595086695b9502d3be0bfa34dc

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