Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a05f94210f6bd5e…

MALICIOUS

PDF

89.4 KB Created: 2021-06-13 16:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d0e9c736aedaa82c0030c7ec523b23fc SHA-1: faaec0c0c005d1e2cb62df034839f4d7bf26f69c SHA-256: 2a05f94210f6bd5e27e4cb3f8380494829f440f50ce3849f47245bde065ca3cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to compromised websites, many of which are hosted on disposable domains and utilize form-builder plugins for file uploads. The primary lure appears to be a link for 'autocad 2016 electrical 64 bit with crack', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/uplcv?utm_term=autocad+2016+electrical+64+bit+with+crack PDF link annotation
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbec00db4e---27228110722.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd32d08e1---kipewodulegewirifanonel.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b486b961497---pewasegovufolasukez.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/ad548934f6bcc3284c00a32b5f8fe08f/kidugumowizijejowob.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/9004274804.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/806034461d337d55fe148b7b77e0409a/dejewapawukebuz.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c58f1d0724b---xanujonabelanana.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73e97da015---46150188220.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1492fe1857---97050444142.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/loxufupobiwotopek.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/tijawujibukanoke.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/255afa8b6994f7166dfe395142d99ff9/wajatixuxadebod.pdfIn PDF document text
    • https://tlniurl.com/1In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 3536 bytes
SHA-256: 5592a71368b3ec4873b6aa58972770af30665fc191daa52cb03b5fc44ee5ec9a
font_01_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 5704 bytes
SHA-256: 565a9e235a1b45804e3485f709b0d13761d6ecdf557bf77860f172a6b81a9d8c
font_02_sfnt_off00013002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13002 11752 bytes
SHA-256: cecb574854550c29565424fc9b43b14a1bcfd188cd5d2132b8f1161b2603f472