Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46d5f9ef9e99a6b…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 00:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea6e32c66d0b761f904bc6b82afe62ec SHA-1: 852e7c4142cff51d60387530da814abc3dc075c7 SHA-256: a46d5f9ef9e99a6b8adadbe59442747e6a518f4e3629be256032e6207cdaa816
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic suggest an attempt to lead users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://anhhuynoithat.com/asset/files/6643009254.pdf In PDF document text
    • https://alariel.be/userfiles/file/7530409771.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/lulorobinimi.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d566d6ec9965cf0b79a5d61747f18102/47692130198.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/bafipifamejavonapubuzixo.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/jinanafiroxuzakomobazumo.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/tebijimifiwirudiw.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/padivaj.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/34443248633.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/bebufadin.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c8af82228afaad01f7fa4fbffa2b9ded/9706153266.pdfIn PDF document text
    • https://ms2oke.com/contents/files/xaxuz.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/9791448571.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/wonazakiwepabogego.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/55441691613.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/1808739894.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1620ca46---fufogosuvuzuzuxeder.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/fezifudi.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/gozonajosegaperus.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/92541195025.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/26036306188.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/sogugepolikukulaxil.pdfIn PDF document text
    • https://sitarasign.ir/data/file/93398565754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=descargar+videos+en+android+gratisPDF 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_off0000b905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB905 10564 bytes
SHA-256: 7f50e685aaf951665f74307a168175d25679324ed593745cd411efe36efee6e8
font_01_sfnt_off0000d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 16024 bytes
SHA-256: b60c3416d00570e49eb3beb573edec5208f7abc90f154593e76f7232dc91f958
font_02_sfnt_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1