Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f76198ec70c389c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-30 19:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bf9b64857387386ddf7ed490d6fb7f5c SHA-1: a7a25706cbfe5359d151eb0ed5735099d04df164 SHA-256: 5f76198ec70c389cb8a5914b61372cdac015fc004d0f1afc30b685549623c3f5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term' parameters suggests tracking or redirection, common in phishing or malware distribution schemes. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis strongly suggest it's designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://infrive.ru/uplcv?utm_term=stickman+mod+apk+download PDF link annotation
    • https://mabuksusu.com/contents/files/vixukebalivo.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/14980859010.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210913000456.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3360875a42abf4243a693c0fa078fbd2/nasirive.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613750f6b774e---93367720448.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/matejetexadanebegilewe.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/2084837903.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/6752977252.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/87471507397.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/mewibu.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kigorebufeperutu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134736b1d667---mifelekomukexokavutinu.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/27458305593.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/dizemov.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/durifilubuvavoxewibop.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/12492003501.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139191b84343---rujudodafuje.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/guwatirupinevorozapegibob.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4e3af4bf---jokozinopokefogaje.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/lipefetidomenasusifel.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/16415130393.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/zuziwufoxavu.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/14752334268.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b597d0315d---43639691432.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090122043773499.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/3590431583.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_off0000c066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC066 18672 bytes
SHA-256: e594b6285f08fd161d1904b8910f1266daba03366aadf383c612337df42cd491
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 10528 bytes
SHA-256: 317bb1cf7a9233ce3d3adbab7f803579bb964c2539437b06606fd81694a61ad8
font_02_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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