Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe43eb38ca5d717…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 21:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f3bae439094d17afb1c5f9617fc7f02 SHA-1: ed68634b4772be518797a798020dcdb521311171 SHA-256: bfe43eb38ca5d717586466a537c40b158c78b15ba3850de4766a8e75f904b100
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to external PDF files hosted on potentially compromised or disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://amidoux-peintures.com/ckfinder/userfiles/files/83307916116.pdf In PDF document text
    • https://ph789.com/pinhsuan/files/file/madabopapapibijunar.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210916222831.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88187932927.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/silakevejinipone.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/79829950620.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/33529330865.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377d4c93ce6---23657635102.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/kategev.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/nebat.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/xipexodig.pdfIn PDF document text
    • https://toocapen.com/files/32556663077.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/bikenavifenis.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/jozuwubulituxixidut.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/68e8b2b461e1907d0d4ed2c38232c123/riboju.pdfIn PDF document text
    • http://355353.ru/userfiles/file/28065145197.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/vebisoziril.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d084e8055---kekel.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/54318374580.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/xijuxabenusimefuguzexod.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/82948107218.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/82128737518.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/40928718624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=suicide+squad+full+movie+filmyzillaPDF 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_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 18780 bytes
SHA-256: 681bb4e523ec5b9a01c2ed0c666d8f6c9a4ca11a3b4bc8bd99f120bca69132ef
font_02_sfnt_off00012bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 10896 bytes
SHA-256: 9588726a20532b3811c98de04801d37c5e1b96f8249e9a190410de55c1b9ceca