Malicious PDF — malware analysis report

Static analysis result for SHA-256 b072f7eaa140b965…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 00:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ced2fff5e28d63cdb35b98a7e9ed9dd SHA-1: 8458af70b21c40608c604201934979aed6cd00c7 SHA-256: b072f7eaa140b96506d4578554f08617cbb70390655033c4350bd6e43890d71b
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external URIs and link farms pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of multiple malicious URLs and the overall structure indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://crewmak.ru/uplcv?utm_term=includepdf+not+centered PDF link annotation
    • https://xn--pssa17sw71b.tw/upimages/files/nevanedeke.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/n9odiaj2i9m6k2tdmbgkkeg1dc/luvugofapisuludetitasukav.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/1665651c81a3156748c4d1f80a32c9ba/40964394147.pdfIn PDF document text
    • http://tyextractor.com/d/files/buwowaxopexuma.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412ca967b9---45275860498.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/e9h3pj4lrsl6rd4dgk5r9605j4/49803766221.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/67000868705.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/67982708104.pdfIn PDF document text
    • http://lawngo.net/fckfiles/56866765185.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/nilatomobotiruwelalefem.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/3b912e7bae160a470cc49cdbdc9141fe/bawogiluz.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ad2bbe484384334228cd07e016db06a2/36797427529.pdfIn PDF document text
    • http://zuche0551.com/upload/file/xuvojofatufobiroruwerigan.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5ukuc6eml5je4vranp20lijm63/vijibofasudifovib.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/pewowoju.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/tocpkm4m6d032l56eadl5mllf0/74603365262.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/xuzokosokerejagadu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1e660b96dd19961d311ee5c2e1921c66/39965238675.pdfIn PDF document text
    • https://parc-hotel.info/file/75348883228.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/slap2i05rlvc3rsqmsd84b8d4s/47534359047.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 10244 bytes
SHA-256: c3a172a6d977bfd7c8cd7b1d2e9382af2d1dc47cb8c2f43d54a0af269c3e4dfd
font_02_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 16896 bytes
SHA-256: c147a461df09b5316afe28137dc7ac942286aec4c0c1b92bc644858d919c6d32

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