Malicious PDF — malware analysis report

Static analysis result for SHA-256 a791e44a4aae5b0b…

MALICIOUS

PDF

80.1 KB Created: 2021-08-25 12:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 072e8aae3d6aca8a876ccd3a158443e6 SHA-1: 804ca31ab1bc09cb0329182b2feaa8369827afee SHA-256: a791e44a4aae5b0bcd2c0f320cbe2673dd7220fd07a3dccb5df73752becc37e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e3bced8caa8fb6d564d23bce6e260f2b/zosuxorovazadulitivejena.pdf In PDF document text
    • http://beergolfers.com/blog/images/file/83071205707.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c983d6e5f04---negevodefovijusoba.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e30d0c7c4ea---80826955300.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/laxexuzotevi.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/nidal.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081279a059de---68043941315.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/27463300577.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/35727273506.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/vuraje.pdfIn PDF document text
    • https://italvaping.com/file/dimiroguno.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/telepumimem.pdfIn PDF document text
    • http://centronegozi.com/public/kowolujux.pdfIn PDF document text
    • http://airsoft1.ro/files/file/74648489830.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/zugunigej.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/im7mnb3k0lrbk5httb0nhete62/welasefabujujiv.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d77bddbef9---logasolipun.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/75763748000.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5638dd3c13910905ccba36846ab25008/zavusitilazat.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2fc28685dc4d45ee2123937497cc1d6c/waninanimukitedep.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/tajakuzusawazixamido.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/82457962255.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/31857356095.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/21823377219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=algebraic+examples+with+answersPDF 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_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 17204 bytes
SHA-256: 0cc49d3debd76b5b3fcaad2d1a9773c7462f7d1b7f179861eca3727c3a63291f
font_02_sfnt_off000119e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E9 11008 bytes
SHA-256: 9e54c94086ae8c75552fe43e73c483ac46b806779c5228625c2530576a1e5da0

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