Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2d45f17c170b5d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-21 12:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa6e53958db76775ba9bc9d3c8124b95 SHA-1: d882d0430e71c46150e0f3b1a563c8e8276259c1 SHA-256: bc2d45f17c170b5d1492a72b1d4cc38c2d2d97b295d4783c7fcfa660afe007c7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a common pattern of using malicious PDFs to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=wifi+finder+android PDF link annotation
    • http://fertilityupdates.com/userfiles/files/36514191492.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/kafexib.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a7aa7c483f675d5e862c0c6ae22361bf/49717948920.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/22277946469.pdfIn PDF document text
    • http://someteme.com/archivos/_20210917101435.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/motatopex.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7ad314c93---74193249849.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/dazefej.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210920041657.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/29856556631.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/64508735183.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/77535959670.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/vavepifajesuk.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/59687309465.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/mugizawupuzafavo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c36e5f53351f8bb9881f95ba20daef67/josimivorixubotadewo.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/3147557108.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161361e5379081---41880592453.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/getebotil.pdfIn PDF document text
    • https://miet.hu/kepek/dojibokorogavolomov.pdfIn PDF document text
    • http://horvathortho.hu/tmp/kabezojafojalix.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/pederuwevixede.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_off0000d067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 18132 bytes
SHA-256: 12d2cd03a867da26fe3800c82ed37cc5339df56c389035f8d56004d68dbafefb
font_02_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 10028 bytes
SHA-256: 592c9d48d9fb98ad0497b861caddae35bf4486f052793977058f3f0c1cc3040a

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