Malicious PDF — malware analysis report

Static analysis result for SHA-256 072b8a63fda0c105…

MALICIOUS

PDF

88.3 KB Created: 2021-07-01 22:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 283cefaf06cf3c5c2435fa351b800791 SHA-1: 971ba32f9eb12c158a368ce80c4549c2c214eb23 SHA-256: 072b8a63fda0c105dbe0ae08a729d56de99295d263973b8c8402ddf54695e894
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic findings strongly indicate a phishing or malware distribution attempt.

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://laborke.ru/uplcv?utm_term=edward+hopper+all+paintings
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ae8e58d322e380bb00946ab29e3ab0e8/seroresulajivetuzo.pdf
    • http://tannhatviet.vn/upload/files/topetilasisuzo.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160757e06d9cd0---14646666936.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609102f00b1bc---33884968237.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8799642f6cb233ac36b1b7e23235204d/18306624241.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8630906f231128c04d3a36d4af25c37b/8848823878.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/nuvevumaruzano.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609011bccb17f---31066225338.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608223855f640---mimarevozoj.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5749b1863b---dozibexijamafawakezemu.pdf
    • http://gorisum.net/fckeditor/upload_file/file/tibolawepivetameju.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/j6ni4cf8kg1ethtj65dln33bl5/xijibilajenuzevukitelu.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3b16b7bcc---78364930952.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/21so9ktd3h6mbqbd6acha922g9/39588842335.pdf
    • http://edu-family72.ru/content/images/uploads/file/21155406168.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/7131c5d51baa88c5dcf2afe64b9ec81e/50206601565.pdf
    • http://www.darvidproperty.com/news/file/37253648466.pdf
    • https://fzclicks.com/demo/files/editor/file/10543274031.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc150f97b11---38970804072.pdf
    • http://kursadowicz.pl/Upload/file/lototixuwadulujamonawus.pdf
    • http://automsystem.com/UploadFile/file/20210617153102971.pdf
    • http://gialtour.it/themes/userfiles//files/11665527669.pdf
    • http://merlegdoktor.hu/tmp/sododetiwamuvaw.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6b8ebc30---76681549008.pdf
    • http://crescentcarpets.com/userfiles/file/zopinozadexemixuvo.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_off0000f3e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 16792 bytes
font_01_sfnt_off00010bf3.bin
7a1112340142c0709bf4cdc370d23ace955e60e68bd8e62997f30e3647dcadfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 18464 bytes
font_02_sfnt_off00013ba4.bin
a542bda54b14b9844f596cf27820c4bdb4bdba89198fd5b167dd38eb32f788d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 10740 bytes