Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b6e22441c4bf54…

MALICIOUS

PDF

98.3 KB Created: 2021-07-20 11:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70eab50e3d3c3e4bdbbd3887e462df9b SHA-1: 6d1e1d925f195764bd6c92f70f17f45464702b9a SHA-256: a0b6e22441c4bf54118aa540683040c59e7ea4b4a282e61ebf1f50f47361ecb5
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://teddybestore.it/file/20309869102.pdf In PDF document text
    • https://llsindia.in/FCKeditor/file/14792044568.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/uhushe1n6apas48t0d8mdp7iuj/40759317888.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/501bdf46a727eb4d4ae56f9ed0629767/semerizaxanefirotobaw.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0e1a92c4134c27296b72226acdb81dac/lisedofalojupo.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/42219167762.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4a635a9250b05ddb11dfce4fe56c9459/61047242535.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c7ff14710---kilazerupimosejofepogojev.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/davobeg.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/sudatakedoweje.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/wevipu.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55924178609.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a029e9b4300---30615532432.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/84187394893.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210601054835.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742f447def9---monipobazijadufe.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/t1t5hdop3d1hdnk0cfkuu53djv/feviparomumiwonibi.pdfIn PDF document text
    • http://thedreams.cz/files/jabaxepimefezokidaxis.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/25fbc29929af2e2dfbdbae6660bebed9/dujalogid.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/pevajopegijuluxamumit.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d9565ba56---takotavuresobivotuv.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4ab91d64---tonedurozef.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/zamewaj.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5eeda5497d3b764096906b8eec736a94/bekulitigirinuj.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afc268db886---xijexixil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=all+i+want+for+christmas+release+datePDF 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_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 10808 bytes
SHA-256: b2063e1fb1a4ddf998ca6de6701748428ed6bc9f2ea0b6fcddbf8ecfab2224df
font_01_sfnt_off00013416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C28 18300 bytes
SHA-256: 860de2fe3331723941bd304b4640fa2227575867ad5e48bdc07e07a89c97161d