Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e70304a3b6e5a15…

MALICIOUS

PDF

84.9 KB Created: 2021-06-27 20:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2009814401347657386220146ddf1192 SHA-1: c84ad62787de08e1045d1e0a8f739a7ae32238d4 SHA-256: 4e70304a3b6e5a15c450fe87738fce346866f0af7679ae6363663637e74ccd08
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://airshow-bg.com/file/62921718165.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc761cb059---89017886752.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60aac2521---795762919.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/ca38e27c62144aa2a2624d12a2b39b8d/mifazemefejerevejo.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae73739901f---milenevufus.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/fvjml5ibn9vdmg08t6kvpbb295/98936375932.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/t2uh1gkgpj9kjeeke1qta16c1h/lenigujud.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8a7a96b2ffc9a886c5413f03a96353e3/zofidikabi.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2aede920f---didipirixunexe.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d54626dee33d9d674b05c36c3dc9c71e/wonakipupamujeju.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b166097ff8d---19746500781.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a00ff03e24a---36273184154.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609442bde16d8---kedugugejovenux.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d08814009---11318479404.pdf
    • https://coil.hk/upload/files/11697221751.pdf
    • http://shiokuda1.com/contents//files/tuxusixategikovigajefetom.pdf
    • http://gfhs1978reunion.com/clients/56625/File/sedabune.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/74812798014.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af6231c4dc9---95953226277.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/tot7mc2u50csdsellul08sn5ff/77786898421.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160741c77e788d---5212870520.pdf
    • https://gw21.ch/uploads/userfiles/file/51657634519.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd831dc77---mivipin.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607791ae825e6---xapewemirodimab.pdf
    • https://dcoderesearch.com/uploads/denosajuxutogobapa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tubemate+download+for+pc+windows+10+64+bit
    • 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_off0000e7bb.bin
7706d74546e633e025deacd0fc45596e8fbb9a190deee441862e27547a09084d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 11492 bytes
font_01_sfnt_off000102d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 16792 bytes
font_02_sfnt_off00011ae7.bin
f70cc043c7ece621a6e4878c5a066b048e9b316f1ce4ca597b4121c5b2eafc54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 16668 bytes

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