Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3b6bc7a25a5889…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 05:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b80d873bfb55b738442cb6a3ab493ae5 SHA-1: 4a31c62beb1ffae20600bbb46c21993826327668 SHA-256: 1f3b6bc7a25a5889703701bbcfa67081bb8642c8c6310ba6cdbcc506c7077ad5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to lead users to malicious content, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/be2b3f908ec77c0ea6cd86da54d17282/93815548291.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/revobip.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/114943ef1e9948d77f5fe0979d0c50d0/xasopezenujatuzugatawiw.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/tenefotaxotuwapozekog.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118817948fc8---senavokasi.pdf
    • https://subarini.ro/mm/file/sogaxafijipagudovuje.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b6290b80---69431501744.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130a591ae065---kedumuji.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/391ec033d5743fc86cd6f62df13098f1/lepejopejidazagi.pdf
    • https://alutat.com/data/file/37577164676.pdf
    • https://ahreco.com/uploads/news_file/20911000066.pdf
    • https://digireg.es/upload/rebavobiliwa.pdf
    • https://churchboys.org/userfiles/files/29748875560.pdf
    • https://bamor.org/userfiles/file/fevusinubom.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/kmjdb3k4rpt2nj1b5tlis0er35/31283112245.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a741bab4af17a49d44e877c28d9854e/8593644224.pdf
    • http://z-sinpro.com/upload/files/sopidelos.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607584c070ddf---lipazovo.pdf
    • http://aliglobshop.com/userfiles/file/69531916655.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/6c9d0cddae953a2a96e9bec106ff2489/62720809656.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b7e17213e---81689243523.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763e93083f0---kijotoralepiguzuwig.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0242bb4fdc---disemexojiwaresajogez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=failure+of+tribological+components+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_004_off0000eac9.bin
a714eff04b6ea11052a5c4f5544f4993a1af6033322dd693f7e154a7d6f66730
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEAC9 18832 bytes
font_00_sfnt_off0000bf6e.bin
3350a275a2ab6e0ebe8a3961c903814dc30b45260b950ee5c79994aee74d14d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 17100 bytes
font_02_sfnt_off000108f7.bin
afe93e4e03f7d9eff494b689326295c53b7db1b2c6febfe4f5a74b0146f0fbb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 11180 bytes
font_03_sfnt_off000122aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 16792 bytes