Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa78820816f22ef2…

MALICIOUS

PDF

96.9 KB Created: 2021-06-26 02:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fa2c8b20661c36b66062e9c3bc5cd70 SHA-1: 8b354c273192bd2246d651053d36a05ead45de08 SHA-256: fa78820816f22ef2d425d71a84b219b52dcb1dd5a64da67bfe766f49987932fa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress installations, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebecaa776d---46794821393.pdf
    • https://deltagroup.bg/uploads/file/5539151753.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/99513225031.pdf
    • https://tenekedjieva.com/uploads/file/39166383199.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c0fa51f4eceaa3128d9366e8627955e1/susewilaritulalebib.pdf
    • http://allprintusa.com/admin/images/file/xisilaluru.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54afb9b53---94981531160.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd387ff72---pesixud.pdf
    • http://xedaptap.net/userfiles/file/jidodifufixiwuxekuvo.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/818f3595ef19aa01cca549d0c10eb640/60704953050.pdf
    • https://myphi.biz/nbloom/fckuploads/file/73384047004.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899f2a51c82---98287618178.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3rogg56fe937c02dgemrm2cl04/23962823260.pdf
    • http://ideas4mypool.com/userfiles/file/25946698666.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c26e29f0c27e4b72c7e0754e296dd7c5/manifez.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb632cf938---mazuxi.pdf
    • https://alice-immo.com/userfiles/file/muzupazikawamosopoviv.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/4243fd7911daac1abb9985e824a3f1c6/43337629879.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/477i6srr505dq32gbv13ria581/gizeloke.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08d3c66c1d---dunexowevasorafivuxe.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/detivosizidura.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d6e760571---xoritalojikumepu.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/m1j7v6cbh91eg29vfsun8q68b7/kukorifotozojifebisupu.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9f461da78d60d60b479e1f0e9e40395e/givawosaramowulunaniro.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=diploma+in+dental+after+10th
    • 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_off000118ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 16792 bytes
font_01_sfnt_off000130e5.bin
412496299f294440ae11b2f570afa45bded3c6d35302b0c644b859b19e408f02
pdf-font-stream PDF embedded font (sfnt) at offset 0x130E5 10772 bytes
font_02_sfnt_off00014968.bin
8be1b0e317c6adc886764441f76207f5b4acf8f805dc9d2bd7e1a505e273df29
pdf-font-stream PDF embedded font (sfnt) at offset 0x14968 17184 bytes