Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6364f744ca37b5…

MALICIOUS

PDF

80.0 KB Created: 2021-06-25 22:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c513e12a49a7a2a46921e6266405e1d SHA-1: be30e63decdc3509c3079ea5f1d3b054b6bc90e2 SHA-256: 0d6364f744ca37b591cadb7fca590864393949246e01b13ace51425a74a55048
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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://alimentosldm.com/userfiles/file/8597131821.pdf
    • http://sacoorhealth.pt/site/upload/file/bojuribexevufumikix.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/59b4ef10291c61043e12e52d2169b022/malikajoferu.pdf
    • https://avvocatoboretti.it/file/12311859626.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8311bf7bdbee8dcc1270e330eda9a0b4/nigigavixumo.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79ef361a5---61409220617.pdf
    • http://yishiweb.com/upfiles/files/20210620_025654.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b45ccab0---purikiperoda.pdf
    • http://www.awakohchang.com/image/upload/File/9897468989.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5968ae2380579c7a3f75fc15fb7f0274/watedazeg.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d249bba3---fosujaluzolorapomogaf.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/4g5q6lg6i11d2din1e3886heg8/61017767069.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4100b7cb97---tekamozol.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c35ca0568---zavisebosi.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b40e0ead62a---ragikijevunokoredemipix.pdf
    • https://efficimm.fr/userfiles/files/74361582325.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcfb40e56b---fipesewazasiw.pdf
    • https://pnp-studio.com/fckeditorfiles/file/61410665334.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776bf7d191a---laxadilak.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a9a45156---bopisorilugag.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/72e88c6e1d5406ef74d192a4b1d051b5/80500209902.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fbad3c24b---jekiwegubirete.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096da05afe67---jovulefofikegar.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afdccc7f9bc---gusatu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fpj+movies+action+full+movie+pepeng+kaliwete
    • 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_off0000d11c.bin
dccc783b020ad9369e50cdb6577f840ac7b288148017c4932d20d5d52e8ce115		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 11172 bytes
font_01_sfnt_off0000eb4a.bin
93215234a0a7d9f45b48e1471e27e76781e31b2ffb4204c752672c9fac8ba18e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 18072 bytes
font_02_sfnt_off00011aab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 16792 bytes

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