Malicious PDF — malware analysis report

Static analysis result for SHA-256 52021cebf291f974…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 09:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fedf73a71cddd0a2054085606693f07e SHA-1: e78ef76f232d13ae88f8d4d5dceadf64a8fbf66c SHA-256: 52021cebf291f97431c53628f1ee4dc932ddc046df1bffbbe193a47aeebef3fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://songpinhao.com/userfiles/files/dosimekel.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ad8e2180b6e0b6c8f7cbec2cb88de059/pitowu.pdf
    • http://mawaevents.com/uploads/file/solavoremanunom.pdf
    • https://cs-nippon-cp.com/mailmagazine/upload/files/75729014676.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb6bc9e529---verijafunitef.pdf
    • https://goodmix-psc.com/userfiles/files/mivofozobom.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b119f3adcd7df4e05177c0935ab1718e/16662168865.pdf
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109181414478588.pdf
    • http://nbnjl.com/userfiles/files/6716560650.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/96606983954.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971c76a0fe---36364940437.pdf
    • http://ristoranteyuri2.com/userfiles/file/73045532214.pdf
    • http://roseeskin.com/userfiles/file/20210916095803.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c11196e1452896dd4413fe61e8bfb9f1/jevozovi.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/27241288117.pdf
    • http://argol-editions.fr/userfiles/file/50413212351.pdf
    • https://questyme.com/userfiles/file/30854295.pdf
    • http://karinameal.com/imgdish/files/53889785309.pdf
    • http://esterkins.de/ckfinder/userfiles/files/29173314256.pdf
    • https://futurefacesmiami.com/uploads/file/loxewazitapulazulekadoge.pdf
    • https://sbsoftware.ro/admin/userfiles/file/xosunigikawede.pdf
    • http://sky1981.com/asset/uploads/files/kanevetu.pdf
    • http://pogotowienaukowe.com/Upload/file/855085534.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/df3593b84db905e651e231f0e146439a/92496463608.pdf
    • http://esistore.de/userfiles/file/tagijategitakovilasuvuk.pdf
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/97335778386.pdf
    • http://jenan.com/ckfinder/userfiles/files/finofozajifirosevagan.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cambiar+la+forma+de+contestar+llamadas+en+android
    • 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_off0000e192.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 16792 bytes
font_01_sfnt_off0000f9a9.bin
9fd05a1397b70e53296e2a6df634229dd65409cf1f5ad7e65413c9dae4a67f42
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 10808 bytes
font_02_sfnt_off00011289.bin
1afa51b9d277ea724ca3133c3cfc7815801b80e5f6b5b044dd000704d5040680
pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 19060 bytes