Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f0d73f43c65b12…

MALICIOUS

PDF

91.3 KB Created: 2021-06-28 18:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a75a67d63b7872eb828519dbf31fa370 SHA-1: 7e757ce8e9180f56a07d8db1356fe7f943a3bdf2 SHA-256: 37f0d73f43c65b126fbf24cd41641329498b1cadc400a913201b215d2a9419a6
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and potentially disposable hosting. These links likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bm8oc27b6g0d0mm9eq1ae11f16/xumekemozafuvepiwe.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb10d939e96---samufajagovenideno.pdf
    • http://hataylezzeti.com/resimler/files/devegiripo.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75acd5f81f---47802275207.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1148f56e---noxol.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871131637c0---70318289275.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa381d3cf2---jegex.pdf
    • https://vegan-eshop.cz/data/file/10945445354.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7a1f4202ca4a81b79c8703a2a2624812/widufis.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086bac7147ca---zezufofotibim.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/557661e441df855274168316e1e23b5a/62291881245.pdf
    • http://hilimall.ae/uploads/files/visakekiwejiva.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/74dd93cc37816c0fd0851213ac53480b/37845834784.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/82nfh1ldlkdtt6ea6f2v8s7ivk/gulewilomuw.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f5af38b678eef9a2c2bbb44571206622/98887074457.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608116304627e---guxiv.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a635e4d2770---ketumasawowo.pdf
    • http://gamjagolla.com/uploads/files/wegojibatijol.pdf
    • http://dailygiasi.com/uploads/userfiles/file/17347085612.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/222e8dda97b3868665c4c938a717f8ff/10628546841.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607208e074450---60075721517.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bs6iaf305f06icavesb4hcvlt4/55363408480.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/iarv0k05if07t325sf71jhk8c0/76706515016.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=for+an+electric+heater+rated+4+kilowatt
    • 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_off0001039d.bin
73aa2167008bd2909d75012793e1994eb04096f52f7647a7964ca2332a9a4f6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 10532 bytes
font_01_sfnt_off00011b96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 16792 bytes
font_02_sfnt_off000133a8.bin
e6f09acd72bfac3aab82c66a21380ce4adc6dc75e2472a2495eef708965618a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A8 16884 bytes