Malicious PDF — malware analysis report

Static analysis result for SHA-256 896e49f400ce625c…

MALICIOUS

PDF

95.6 KB Created: 2021-09-04 21:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 715676bf9816a2394fca7d7a8afd2e69 SHA-1: 9c73599c3ea2f6e4c65509803f827cfa7e596207 SHA-256: 896e49f400ce625cb431bd8f0795aa7f9d6dd5f2244ebd6e2cd305654169f99c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bloomx.com/sites/all/sites/bloomx.com/files/24298245130.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/70441042314.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/467dd8a66e45ac0acc8427771dcb96a2/neganidu.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2821c6cb2b9b31f1db6c97c12b6263e1/17384478006.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/432a9e07c836d761dcaecafdc9883db0/wepulofirakesixoza.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb021718ec4---gigidatolidifi.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/622126b5a4e6d4bb6295cdf9fe60f574/98860621777.pdf
    • http://volamtuyetthe.com/userfiles/file/zeveno.pdf
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/74300652232.pdf
    • http://bielwod.com/userfiles/file/33284405658.pdf
    • http://lyzebrno.cz/userfiles/file/69833248804.pdf
    • http://waelfawzy.com/userfiles/file/32139409169.pdf
    • http://zgkimsteszew.pl/img/upload/files/95538836181.pdf
    • http://hakkabrothers.com/userfiles/file///76985268669.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c0442932c0c05d5ed68945444b0119b2/ledafofebi.pdf
    • https://chp-travel.ir/data/file/gikefosijusivakaz.pdf
    • http://jjw-led.com/userfiles/file/sojowamavapojebux.pdf
    • http://kalikraft.com/images/file/wiwetos.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c693c59d30---zuvajuvebotobuvukuw.pdf
    • http://jowinbio.com/upload/files/202108251206425378.pdf
    • http://toyteepee.com/uploadfiles/file/210714012224071719ty69rl.pdf
    • https://home-consult.lu/userfiles/files/2870677266.pdf
    • http://dagmare.de/userfiles/file/58141116374.pdf
    • http://sdds.be/userfiles/file/fewije.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=diario+pizarnik+pdf
    • 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_off00010bb0.bin
bb24e388bb22e1e1f83417502d1d3a3d556d11eda97e71fc284695ae23272162
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 21064 bytes
font_01_sfnt_off00014197.bin
9959e97602f99c086aaf06c251d038c5124de3c92910ff20d81d56925ec51aad
pdf-font-stream PDF embedded font (sfnt) at offset 0x14197 10200 bytes
font_02_sfnt_off00015886.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15886 16792 bytes