Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a259c91be43c6b…

MALICIOUS

PDF

89.6 KB Created: 2021-08-06 21:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca8f6d1424b9010806051cf17462959b SHA-1: 7b5d3e5e31633b1ce61aba1f3eec34819fde6eff SHA-256: b2a259c91be43c6b990cd2678df4c3070c519660ae271e4c08fb633298b01485
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, indicating a likely attempt to distribute phishing content or malware. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://goldendazzle.com/upload/quangtri/files/38298719722.pdf In PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/33893500831.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/2b706f40f0e96bbad685aa9e05e96f8b/53199848566.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affe7ca6b32---pulokujafenidobimurip.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70e284743---2465022206.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/80178235012.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/308ea431bbd2f48e99157a73ed7ff9ea/mugatalonogeza.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/topivesedaxeva.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/velisogipixol.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/43219779983.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/lokanagugebasosexa.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/wifakibiwuwigujen.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edbdefb3442---bakafofiwibu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fae35c51354---73170714220.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jajavu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160759d8cf3f6d---padefapifox.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/3949f15da0ae1fbca7a00c852c25b9b5/xaweruf.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/35377342405.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/73435e24ea391c50886fc0be7741f738/31951550219.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160961beca0ba7---fosedexetuwefupoxug.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/93314696837.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/867957475.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/tfvmdupuebvv4rooma6faucq9u/24995395005.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/nosanep.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/55869370761.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/tojiwavamukidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=solutions+manual+for+physical+chemistry+for+the+life+sciences+second+editionPDF 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_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11202 16624 bytes
SHA-256: eb797bf57e4ed33ba16be06721992ed4895a49a2ed5f818a47b01aa9f0350025
font_02_sfnt_off00013d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D46 11176 bytes
SHA-256: 1d8fa237e8ef6f4fba8c865d0d8a617d8dc771f710c71e90ca9629d229850cbb