Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ddc39133536441…

MALICIOUS

PDF

83.9 KB Created: 2021-06-30 08:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15a4cae1e03faab2caffc47626100849 SHA-1: c370d7548a18815d1cf65ac25afb7ffe638fa8c8 SHA-256: f6ddc391335364411081e47bea7e48ab0b59a987ad762cc4b4180bf5aee770ab
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oteaexpert.fr/cite_imgs/file/wekokigumawijinosuv.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608570b8d3246---56818054136.pdf
    • https://alexandrapanayotou.com/web/images/static/file/15534879059.pdf
    • http://animationcoach.com/userfiles/file/91991485681.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0d5de4e68---rinonivixudu.pdf
    • http://elitaliaweb.it/upload/file/bikazudobepalufazunado.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d9b810771---592977936.pdf
    • https://youkuvpn.com/upload/files/ferox.pdf
    • http://barcelonasixtytwo.com/userfiles/file/jerowevudewefuwapi.pdf
    • http://automsystem.com/UploadFile/file/20210607070917510.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/394368e72391ad24ab1aa1d395e7aa8b/23746650525.pdf
    • https://davaocarrental.com/images/file/91488927106.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607939a2d862f---foluzozularurar.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160714fcb84d07---manow.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf0461684---nupepenejimazobeg.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/1487ovojs8tvjik8k6gvvnem3u/kefodelibigore.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3d8cd452---18823270686.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/nh12tetj1fgn0lkrf48564kslu/99411970425.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609625a3900f1---81031449050.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m6ke8fhvh745bi56je2cb841d3/58511739481.pdf
    • http://bakoca.hu/files/file/21556797434.pdf
    • http://www.siposferenc.hu/html/gadufuzereg.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/6f3f14d82b6a67ec892fcbae3ff8c11e/didota.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+arithmetic+mean+of+first+n+natural+numbers
    • 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_off0000e5d1.bin
97c3fdc0709eeae040e4b979c34fc0a1344b80a5f9c745ae15f8a7000ef2916b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 10804 bytes
font_01_sfnt_off0000fe8b.bin
65b53dae6ff879ee825886f43f42c31e73284f93c29de3a7184ab50f234267ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 16860 bytes
font_02_sfnt_off00012a52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A52 16792 bytes