Malicious PDF — malware analysis report

Static analysis result for SHA-256 1039ffdb02ec1b6b…

MALICIOUS

PDF

106.2 KB Created: 2021-06-25 21:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 296b7c9e5bd6f13745d042fa7aec1c8b SHA-1: 003b0d116af2cbb58e46fce1e11ac6006c447f4f SHA-256: 1039ffdb02ec1b6bec29272db43ee8a3f5707ee13e87693746581dd7e6f89af4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to manipulate search engine results or distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9815

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 https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/jhr87of2vnggv0fvvl5cebm7io/27015498630.pdf
    • http://askort.pl/Upload/file/xevukekupuza.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a2d5ed36e833916f16e7dbe0b04c0051/magufomitetezim.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/56882851530.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/67128827973.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609483ed7dcb2---97122456232.pdf
    • https://299-45.com/CKEdit/upload/files/25602467195.pdf
    • http://worldprint.su/userfiles/file/1549432866.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/msqrtjh0ss3g490jqt55d8rfg6/vosutakabebojirelixado.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0d82db39035eb7c043d1d057eb7d5a9f/46535105305.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c746967fdfa---waxejavewa.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160887af1d2867---47501753233.pdf
    • https://brs.jo/userfiles/files/baropekixujatetax.pdf
    • http://zwickerfoto.hu/_user/file/zobuzajabebim.pdf
    • https://bouwservicewinthagen.nl/userfiles/image/file/boduvenosesomidopapu.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf57aa0ad6---dogalina.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad540a1b82e---fuwamin.pdf
    • http://a-swiss.com/upload/userfiles/file/5310366077.pdf
    • https://nhaccugiare24h.com/uploads/userfiles/file/mapatiwugavorin.pdf
    • https://secolink.sk/userfiles/file/nofavez.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/dk9cdqs4bcojm9e0pam58tdno5/wararenizolakodivomusavi.pdf
    • http://dichvu12h.net/userfiles/file/89484035908.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/92695919bead8bc613cb7020166ea9af/46073738141.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2578376d7a---faxuzijetimivewipafok.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1821a33cfe860c9469a1cb41883c494d/bofibonagen.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc64b8bbaf2---zitexigawopuxekomejugete.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ielts+writing+test+samples+with+answers
    • 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_off0001404a.bin
6a11c60684b11cda872c5d677974688d11a420f0c87c747274d8971861c0b91f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1404A 16388 bytes
font_01_sfnt_off00016b13.bin
20e1bd04d580e092a623b1c2bc04711c28641c1a565be324bee9b268632dee1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B13 10616 bytes
font_02_sfnt_off0001832c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1832C 16792 bytes