Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ba6ac19423222d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 06:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 337dfeaf2d0dd8230f3fd2a458afb391 SHA-1: bc5f2861fef470de51fee10d4cfe14e67abf2493 SHA-256: b1ba6ac19423222d2e49b8628c4b57a94a44bc33fb8bf84ab201ab9ab0137d80
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which host further PDF files, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=jack+sparrow+tamil+full+movie+download PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00fbef1f2---dokudelapojega.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/48900347902.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/75312798409.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/tawopuzurepumolojofizirug.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/dogasukamakazejabe.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/95720245772.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ecc1c01e584ac2d83e6de759fd613a82/36880404107.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/xudodef.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5cee85a5d---bujivumijamefikomulokavu.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/xivitutekobuw.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/16907438899.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/baduwisinexewisetubukas.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/875a08a28283c3327d4a66a448754ec8/xisirisosepemul.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/lokedogafaxegi.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/nuxuwovulutoniwafiginu.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/marowuzafukadigevajaruta.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/37631366254.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/43060158824.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/93464868147.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/77719395469.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/nisakugulonijegavomude.pdfIn PDF document text
    • http://opersan.com/file/44389045094.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/55740412952.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/24309041727.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/47601326689.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210904145139.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_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 17792 bytes
SHA-256: 9aa23f20a333b186d52c6dcf069b0a35e48a1985db24e1b8afad828136eead08
font_01_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 11116 bytes
SHA-256: 9c6ae22ef920a14c73ac3e906289017d2e93d622a1179225f25f87a2ff93b014
font_02_sfnt_off000128bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1