Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6eaba51b07136a8…

MALICIOUS

PDF

135.4 KB Created: 2021-07-05 14:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 33927b9c3bbb07f034fb8cdcd5c86b87 SHA-1: 265d56762a5fc6f9cbefeb09bbcca57d902a01fa SHA-256: f6eaba51b07136a8670092e90b4252756eed425c5f196910b0f85d62ac0612b8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress upload directories, which in turn host other PDF files. These links are likely used to redirect users to malicious content, potentially for phishing or to download further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e10eb9a95---69592398593.pdf In PDF document text
    • https://vayamcs.com/content_files/files/xurepuzajijitovojuwuweje.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/38137801233.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/65862770001.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/0cojbkj2k3dqs5mamui4pirdg9/49312577844.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4661425e7---63867214105.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cff2b9f12f2---84956798511.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/40979377089.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/17006609360.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/xepipapuxutasadagox.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608264e348ded---gilemanixafofesukojew.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/96903327203.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6ac37d5323c5f5c421710bfb8372f12d/pesowoxatalugep.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c171b0e9e25dceffbb10e5c1b1466d86/polowexo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607458919cf11---nisoperesagawedizudur.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/48f26e3f42e1db6955b6374d0cb7bac9/jilujasawufubifapimut.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/96551517011f1a0a1dcc920e579693e3/nutavekajiwaj.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e7f6edf68---7067618611.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967630699f7---renekeji.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b84a3bd9d---runesa.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/rabasazag.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/23816a64f5a2d618ed0230ba8cda4cfd/rerexezexokofafu.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d37876f6f5f9e5f086a40787b844b785/34241530610.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/bju4mj6bna84ecno4f32mqmnb4/14273238373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=chronicles+of+narnia+3PDF 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_off0001ae8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE8C 18588 bytes
SHA-256: 7a2bd557cd9d50430f44f13e9557317eec08722795efe8e945500c169377078a
font_01_sfnt_off0001e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F818 10536 bytes
SHA-256: b0d856bfed052c0f307cc49deb25ab8dd59ad5c3403f1aa1fe8333c88fcf3a83