Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01343e37da6aa70…

MALICIOUS

PDF

74.8 KB Created: 2021-09-14 07:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b4c8c6a39aca3bfdf1be8c3e81e9b44 SHA-1: a26d8da1fa42f6e494fceb981cb15b5205236e28 SHA-256: f01343e37da6aa7099b305b1d5d32b850cefe3762953489baf6b30f73399b152
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wastran.ru/uplcv?utm_term=pk+xd+hack+mod+apk+2020
    • http://nandishoverseas.com/UserFiles/File/31652946649.pdf
    • https://diedacorporation.net/freesiafiles/file/fuxir.pdf
    • https://starfoil-mail.nl/uploads/wysiwyg/39500400592.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6afbj0phagcl0jbgp03n1a44k7/19086795139.pdf
    • http://wtmongolia.com/materials/file/28112099446.pdf
    • http://ziva-muzika.cz/files/file/51409705465.pdf
    • http://tunesistudio.eu/userfiles/files/sotopulosef.pdf
    • http://cukorbetegshop.hu/files/84880009960.pdf
    • https://capecoralliving.com/media/file/zidaxanerukipilopi.pdf
    • https://kolbandibileklik.com/resimler/files/4454535106.pdf
    • http://cuacuonanbinh.com/userfiles/file/4019731941.pdf
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/xidirapemunivubov.pdf
    • http://adveotec.com/img/file/pujasu.pdf
    • http://lagerunda.it/public/upload/file/1529737271.pdf
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/fowuzefefapifed.pdf
    • http://debeight.net/UserFiles/File/nukidovosefasubogez.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161398ca4351ce---gidanotos.pdf
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/47756644299.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10cba745e---14908202599.pdf
    • https://esvigo.com/upload/files/39922624707.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fddf2232f0---jezorimopiwutasu.pdf
    • http://tksvolga.ru/userfiles/file/49065394812.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346766db567---najimimuduva.pdf
    • http://ranfeng.com/userfiles/file/2021-9///2021912114804599.pdf
    • http://vpsystem.com/files/fck/jiguwukedure.pdf
    • http://cameragiaminh.com/upload/files/nokosaveluliforatu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfc1.bin
754127874450fad232624910d4009fd3e471b33e8d18a168bf6b58aaa9d0ee37
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC1 17564 bytes
font_01_sfnt_off0000edaa.bin
494c0808dc0d01306fd705e7a86c9732bc72bd2ab9603921521e852429d4c0ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 10476 bytes
font_02_sfnt_off00010581.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 16792 bytes