Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec8ecfdfb215004…

MALICIOUS

PDF

112.1 KB Created: 2021-06-29 16:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1aad769a831eb6cef14dcbb53c13dff3 SHA-1: 4d0ce8ef25ff4e2186065fe9e320f278a776329b SHA-256: bec8ecfdfb21500453436f3c6bbd1604eacdaf3bceef6fa7b7ffbb903cdba62e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of 'utm_term_redirector=True' and 'disposable_hosts=0' further indicates a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82f7b0746---favebavofowavofamazufawid.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/681ec950e3c5638d7e4dab5bf686a3c0/xexupisekadaba.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608421c691114---77575530886.pdf
    • http://evohome.pl/userfiles/file/foletusasanutelu.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608299ccab82d---1333839088.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b129046c1b6db4a3da548f060c8881d/52657597221.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/8e3b881e8bf5b5686d3d9e49f8192978/gukuvufixusuduzaxo.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/rakexamawodowimizus.pdf
    • http://goldenpoolandsauna.com/user_img/files/nitumuva.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079eaa7aeda7---47881107067.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/niv56cnbudlamg2gu72m6f9d9t/junep.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081d1eb5d566---97591540092.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac05ee0301---luvok.pdf
    • http://almar-bus.pl/userfiles/file/tevevazebuja.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3d57013ef7811dd3b8d7a51d7d5cf5a2/zijomonozewo.pdf
    • https://afayl.com/userfiles/file/58477940226.pdf
    • http://fotossc.pl/_files/file/sidifonelufafedefibekeg.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e215b03fd---81531431933.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d89747faa---lanevugiluvile.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b4a0269c---98254853664.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/kb6ldlr269op0bec3qb88r0ihv/44979625426.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80e1a3a53---namax.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a41062431---32746274040.pdf
    • http://wenxuezj.com/images/File/74450745165.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=365+dni+full+movie+english+subtitles+watch+online+free+123movies
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012654.bin
8441a8db89bf1cb106f51399ca845637725ca74c8c9bab21214689a0b0b053ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 19228 bytes
font_01_sfnt_off00015835.bin
46760bcd3461f68d3f038f4dffc4d60b1b6807dd354223210431cc81f8631877		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15835 17500 bytes
font_02_sfnt_off000172ce.bin
607750d42c4bddf886f6f0b77d1d57e226562da10127e972568dccab5e6791b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x172CE 1696 bytes
font_03_sfnt_off00017ae7.bin
0cefc0e022e11722c395f3e53f12b7c764f7b2daed4db7a3203e6fcac077c568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE7 11864 bytes
font_04_sfnt_off0001971c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1971C 16792 bytes

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