Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88f3855cc544955…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 11:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 76dc6380e02ca39c485f865aa4b22071 SHA-1: c042219557dc368434f8167799330adf7d6e775e SHA-256: b88f3855cc5449550113ac8bd974ee30c38e43e0a8c91c76dee88374152132ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://vom-ragnaroek.de/uploads/file/vovix.pdf In PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/75244963912.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/zoxujudobabeputob.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/xutotiwin.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390ebaa6151---wesusapelek.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/37260148311.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/raxudabugiso.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/dopk07qk2ab5klphmu1irpeno0/laguruj.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/36579623575.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/57413302343.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/budasavatu.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/85724328189.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b0de17422---10640357733.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/54778112828.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/52850265578.pdfIn PDF document text
    • https://susta.vn/userfiles/file/92975261310.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/pufijunubigiwat.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/zimipifeka.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135bea651778---20699516862.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/16045505909.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/rokozelenetibosa.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/nifadepabaziwaruvime.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/10726027349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=period+tracker+for+androidPDF link annotation
    • 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_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 17756 bytes
SHA-256: 0e5068016f45e72a120a71e0d89a0bfd55d3bb9b201204c6b58481440534d5d7
font_02_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 10348 bytes
SHA-256: 4e52790a8a75a2623faee3ed7b1d8d5fb6d35cf69e8b872d3e424cee3524bd90