Malicious PDF — malware analysis report

Static analysis result for SHA-256 a176914425e62aaa…

MALICIOUS

PDF

82.4 KB Created: 2021-06-30 11:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77c56dd3ed4fd394874b900a33bf9f26 SHA-1: dabdd5d451113bc2cbf12354c4826d36dab7ae95 SHA-256: a176914425e62aaa72f73cafeaf1d796e2caaaf742dca10e7d47af9c9130130f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://catamma.ru/uplcv?utm_term=equal+chords+of+a+circle+are+equidistant+from+the+centre
    • https://larioenergy.net/uploads/file/73459616953.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/pi8mo9qe3u4mgh2ah7n8bd4to9/vozidiwaji.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fcb29ba5a9a527e1a7101c1d4845e211/woguwomufudogu.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/filexemozigemowomeregajoz.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4bfe8bf6e---logebovolu.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/49b6ea55ec8596369300382cae7e8b90/fivulaselumofuzojixudenol.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/joohd0mjtt4hmsb66j756n7dbn/gadejofixinodedovexap.pdf
    • http://wskinbody.com/data/boardData/files/52952267456.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072020e514e4---95499728694.pdf
    • http://kingalbertltd.com/uploadedfiles/file/sovewuvedamakalufuxe.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/3338c6e3c72bfaaa6cfbdf4ffc1435a1/73357140880.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/61365006e334251d9efad73c6bb2b7f2/14313309606.pdf
    • http://interwork.sk/userfiles/file/dudalalibedok.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160948208d4d38---xegip.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160834c0f77a12---fumafanixagivetuniteri.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62f26f97c---82413208861.pdf
    • http://shengnabei.com/uploadfile/file///2021062304424387.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee90d206ce---70978858873.pdf
    • http://mevlanaasm.com/resimler/files/xenotejimekofulekamirow.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079e55814df7---jetipelugemomevexewidaka.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c056609a980---rejuporetiri.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/gh007j9u8ml7f5gp9jgeaof044/resibigujadisejeviler.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1a94d262ab5d43cc758617ab0b8728c2/verusore.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000c70d.bin
c676981130a789d27ffccb7707a65deef0159af9e168de485ae73a22ab5b3b1f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC70D 17356 bytes
font_01_sfnt_off0000f499.bin
559871737bb08feb8b669b7e26b990fd0a7c588dc95f2f7bfc2c5232bc7b7e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 10968 bytes
font_02_sfnt_off00010da4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 16792 bytes
font_03_sfnt_off000125b5.bin
7d021a1735e72e2d4fd16d1750f0e82041cf66baca08667ccfe38d67c512953f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 16224 bytes

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