Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ccd0de3e13ab182…

MALICIOUS

PDF

122.8 KB Created: 2021-05-27 17:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94d6fc5ebd6d614bedaaec2189185b72 SHA-1: 985a39f76170693c8b07e1b8e1f1b51f4db9a633 SHA-256: 9ccd0de3e13ab182c52f8164cfd164e97ca94f7507cf1c55c9e94ea9dca20a46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9010

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=understanding+and+using+english+grammar+4th+edition+teacher+guide+pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0af830adca---63389068332.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608585d074436---woxuzapavuxu.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i76s0uc79je0adtc91lm9g1ce7/13333907586.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c395ebcc67---gituvizonulimej.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/76216252b1c27428c99734ab35fd31ca/99235398856.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608054549500a---sirulaki.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898365c89cd---83107502915.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/635f1f4436f3dbcacd20ccec291dbd68/nepog.pdf
    • http://monkey-do.net/userfiles/file/zaritiridovoloxis.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/539fe4079ecb359d56e7ecba0dfa8bb6/86713982571.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4369b7114---kavidusare.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/50a5sbogq9irgvmk6lbgddh93v/95958796475.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088162ab3d70---25088156998.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dada4452b---fatodabavusik.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/5ktf8tj5c92v7p0rvu04dl0ri1/xejunik.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nari0csg22tr7c4povbl464r25/lomekiji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6efd6e5c47c83a1ea748cadd564c4f35/zupekoxodatupigujuloxo.pdf
    • http://scripts.sil.org/OFL
    • 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_off00019023.bin
29fdfb3d23f7c869ac32e2a996ad7052700e39b4297f3cc423b724eb13b43581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19023 5648 bytes
font_01_sfnt_off0001a338.bin
5e73fe4ef5b14cdde3cfbf629f75a92ac68bdb7544445c72c3809c8704344087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A338 14776 bytes
font_02_sfnt_off0001d37c.bin
6fffb1aeb89666cbcaec4ce24454e19e9ad5757041bd2745d7057949fb60916b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D37C 16116 bytes

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