Malicious PDF — malware analysis report

Static analysis result for SHA-256 83727f1e24aae192…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 11:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1aaba351a461d9de5abef5c75094d849 SHA-1: a637674c4977f96f976beeb57ccc5ae4db9748a0 SHA-256: 83727f1e24aae192d5449ba3465ad2d2036d5f057f1ffc1ab22d544001809109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the true destination. Heuristics suggest this is a phishing or malicious content distribution attempt. While no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection strongly suggest malicious intent, likely involving redirection to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075398b8d239---38321058812.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/c5807ddf88acdbe58680d3d4b2d795d0/dijuxapukexatep.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b214dda00c---66869609830.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160927bb895758---kagusagotudajiki.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f420b08e1b---7886774654.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/tuxivizif.pdf
    • https://abe-rdc.com/userfiles/file/wejivuwonubutekepumit.pdf
    • http://henanshuangxin.com/d/files/37338741272.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9bd59c2cfee1c6362edded67415ed03b/lepepevekomumetakap.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/945dfbc94695648b4967f84189be07ca/72411977403.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607380bdf3c3f---bokeremawad.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/873hvlvf95to1geihegcs4t552/wigoromamomofusemaxodezi.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9f25efc633ca0f8c2222437dc36292d2/fisoxev.pdf
    • http://phuwangnam.com/user_file/file/dawuvarop.pdf
    • http://ehomeforeclosure.org/images/file/72075383264.pdf
    • http://noithattamphuong.com/upload/files/27338319308.pdf
    • http://getem.plfiles/file/66771104607.pdf
    • http://aps-mes.com/files/file/64641077110.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/81ofp109b9kp8i5j31mh5j9d7j/74026869633.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c046069b46b5bf910f1b4bbb098d0895/donuxajujebopub.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/4db36cf804588080d7978386fdb7c2c0/dezosotukedip.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4264a5e970---2395557362.pdf
    • https://stillwaiting.org/userfiles/file/95405485604.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4e2c7cbf2c8aec7b86fc9126a4dc8cfa/50062372043.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=phone+has+no+internet+connection
    • 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_off0000f27e.bin
d1ef6fbfb4488aa188d226897740e987ede6c97f4e1e33ee80bce297c1877355
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 18076 bytes
font_01_sfnt_off000121b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121B0 16792 bytes
font_02_sfnt_off000139c7.bin
2c1132420242d83d6a7aabd68d1b4c677e87219aa96067da91421622ec920cba
pdf-font-stream PDF embedded font (sfnt) at offset 0x139C7 10280 bytes