Malicious PDF — malware analysis report

Static analysis result for SHA-256 904587f31b9ca0c3…

MALICIOUS

PDF

74.3 KB Created: 2021-07-29 21:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e51e730bed6d8616f58ec2a1bb28ef05 SHA-1: 4862ea5c8591b60a53e686731e865261dfc94b69 SHA-256: 904587f31b9ca0c351f9600491b770ab86873d4e69884b3209bf20ab71eac96f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or SEO poisoning tactic. The embedded document body is heavily obfuscated and unreadable, but the presence of external URIs and the overall heuristic profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a027f965e913fa238c1a160eabb9d750/guninematodofe.pdf In PDF document text
    • https://vestol.bg/files/file/sigisibufamigivax.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160786dc1ea979---62394512478.pdfIn PDF document text
    • http://vodnik48.ru/content/file/30717516972.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/12360676857.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/6095375035.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/4c7de279166e1661f4bd3a2e81e9fddf/69329043991.pdfIn PDF document text
    • http://euro520.net/userfiles/file/162535448483443104.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/kuvubiki.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a73862cdd0c---5810722203.pdfIn PDF document text
    • http://rotang.net/userfiles/file/vovataxape.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/84181865239.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/42937359645.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb6e67f29---rafubegabireganawad.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6c97271ea---29583898767.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4bc9cbab54eee6e8dd6fb7b39f13a733/7392900894.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096653b0f1e3---66960834478.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/pirijoxubi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0162292cb4---49782806683.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4445fc35fe7d074143eef4d5e6f2caf4/43322241945.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/kozovuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=exercices+nombres+relatifs+5eme+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_off0000bcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBA 17120 bytes
SHA-256: f6f4776c9d781d1231c55891f246c8bd4cbdf4ce565c9b3b9affcee3a52a7690
font_01_sfnt_off0000e7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 11140 bytes
SHA-256: d6e5ff1d6b22b6192e0c79e1b636e9cd1d5a52df22064fd0e1709117fe01a213

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