Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5afd7009b50bea2…

MALICIOUS

PDF

86.7 KB Created: 2021-07-06 02:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21f1a2ceeaa64b4cdc2a8465c61a0708 SHA-1: 6496623b60c0d74b1cff6d3c8c7a4d89445b8cbb SHA-256: c5afd7009b50bea2cccc4aa18b82ebf544e47767f6fc47b7b81b5b6d07634323
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8ab2c38c3e747885b27726bb35afb1cb/xojajananoxoroje.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bd7f86e939628807ef19ba621567abaa/katafufe.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/itca6k2okorscjj231c75gr503/60092251179.pdf
    • https://alnahamgroup.com/userfiles/file/bepowixedudumu.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3rip106ilo0rfuhfku8ptsef03/84281758639.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4756cfbcb---gakutenegudupizip.pdf
    • https://ecoretras.com/file/jetatiwozanap.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df3a55cd753---sogufifisixopegebom.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/hen0paltuoj9q59kvvn2p32vjp/wiserofaralo.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/djrh3kasr8c8rirefndqg51jvj/bidubeg.pdf
    • https://jxlmedu.com/file/files/20210704_040521.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/31046840828.pdf
    • http://schodylux.pl/userfiles/file/miwomomoxowemogivida.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44f1e7b04---fagivobid.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/13bb8d872c6174467501ee024ee1bcd3/76263655401.pdf
    • http://emke.hu/uploads/ckfinder/userfiles/files/zitatopenoguzilaberax.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lre1t3c7sgohqkqk3lomdo1vlq/fafasojopud.pdf
    • http://obrienbuilders.com/userfiles/file/68293327818.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8be23b3b1b3f99a2af369cd4d8cfcb79/99523839273.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dbcda411b---lomavonufarifekobupade.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a05a25ba---sifidutukigol.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/5775693872.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/48b819841116e4463dbacbc68d969655/58438018228.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+is+a+primary+alcohol
    • 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_off0000f0d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 16792 bytes
font_01_sfnt_off000108eb.bin
3d266b1e2b6bc04999eff464aa1b5618aa2893f6544cfccae9bb9a14e849e873
pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 10508 bytes
font_02_sfnt_off000120e5.bin
53318760d064a7b66833c07d07111be2598b076db1c8477b227cd5fcf757d6bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 16664 bytes