Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d2768db300622c…

MALICIOUS

PDF

114.0 KB Created: 2021-06-29 06:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1da4fab922b6ee197089c2a0fd38725e SHA-1: 7e7a499b884262dbc34d0a41ee55c43f651a64f9 SHA-256: 87d2768db300622c52c58fbe4a731ab4e9e1eae36bcf6307a094f64cd7bf4dcc
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of numerous links to potentially malicious sites strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://birons.net/wp-content/plugins/super-forms/uploads/php/files/48000295cd558b42cf3f87a9eb09f1a9/sojurobubisezedebelis.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec6a4078cf---wokanimepezenamasilu.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bec26d27f9d---570617076.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6p6ihr3hfafl4i4lfqba3u4q7q/finalulupanet.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/6367dec88d9786f8e7fdd17983b356e2/pupizuxidapo.pdf
    • http://amandamaitland.com/images/file/kovapofiwegorolejizu.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/dajigibisuxomemevowavasu.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/446f6f6ff5d088a731acb547f04f7508/mewumuwofavekasanuwuxo.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c25a8b9438---74074148287.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160927bf07420b---kikaxenazijezasopidona.pdf
    • https://asset-books.com/userfiles/file/52603292874.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160915d7d699e5---polipilowetiropatojexi.pdf
    • https://atcotourismtravel.com/userfiles/file/nazerusedotefineno.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f687bae1608deba25489ac0d4a8911c/givex.pdf
    • http://tinnaduraflex.com/uploads/files/80028989925.pdf
    • http://jnnycc.org/userfiles/file/faxatimebozevuraworiwir.pdf
    • https://nevisnews.com/userfiles/20922450620.pdf
    • https://masini-de-ambalat.ro/images/userfiles/11772028596.pdf
    • https://csodamalom.hu/files/files/lakasunoselogukavofanune.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608256c1bff52---93176830553.pdf
    • http://mdsalon.ru/img/lib/file/41013502865.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/15e0d4b891866071ee4013d7b310c529/90485723554.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/jnap1q7rkld18a6k5vdphmvauo/44085322815.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c0dac37ee3d5ab20ba331e31fb5c2e48/44873959990.pdf
    • http://boek.se/bilder_umeny/File/21405107139.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+nightingale+full+movie+in+english
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001583b.bin
6a8cee1ce6f4b9854f1ce31190e7cd2ae6f85cc0e135946b8564ca2b4821af1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1583B 10688 bytes
font_01_sfnt_off0001709f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1709F 16792 bytes
font_02_sfnt_off000188b1.bin
4be68572b0ac0e3cd23501f525be5bda5fe1d53a359d3886e0603e4dcf7d93c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x188B1 19032 bytes