Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad80af1e2075eeca…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 08:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f9aad4922545ac940e54ebdc6a56b52d SHA-1: 8ebbf1ec0e8a15134d3e8109ce5041ca88d8ae5b SHA-256: ad80af1e2075eeca61eccc54a278f3f761ef0dffcb38675b8e79e5408ad329fd
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to external sites, some hosted on compromised WordPress installations. The document body is unreadable, suggesting it may contain obfuscated content or exploit code, but the primary function appears to be redirecting users to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=medial+cutaneous+nerve+of+forearm PDF link annotation
    • https://skatrip.com/basefile/skatripcom/files/51829429182.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/57111874220.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/44665592033.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/pazoneg.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148149d09337---jusojapafo.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d90f12dda1e45fe79140f2689b491d38/32377355321.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/13332881485.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/40136963746.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/xubatozadeniwona.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210904040751.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/xadoxaxefafodejigimozimoj.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/14074372283.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/33021255006.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd60c6d028---ziwunipavafizetisoruti.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/gepozekolitogorimuso.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210905080835665751ky8grgyybxeu.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/68725808298.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/munugufuwujixubaro.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/digegefur.pdfIn PDF document text
    • http://sun-eko.eu/files/file/rukababasorexamamojuj.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/66436589775.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/62216626460.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/57149396580.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_off0000dc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 17888 bytes
SHA-256: 816ddf5d7e5dc89aafff6ad44c854900c148b0c554b883ec8972f703fd9847b0
font_01_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 10796 bytes
SHA-256: 41262964832bcc2473b7df5b3fbed9cbcd5fdedaf8e99ca1a1c8654503373671
font_02_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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