Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d13c40d0c24ac0…

MALICIOUS

PDF

70.3 KB Created: 2021-08-26 11:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bbc83490e2071dcfab99edf3188e3a9 SHA-1: 1324e0522a07b37147f2b53debab358efcf14bcf SHA-256: e1d13c40d0c24ac06a5e2a938dcd89e3ba6cbaa894a9e79740399644716b7631
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious content, potentially exploiting vulnerabilities or tricking them into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5557

Heuristics 5

  • 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
  • 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://akvari-um.ru/userfiles/file/98759616607.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160e8130c1e618---47712488625.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/4sn0jjdknnll9q0eiomg10rqn5/vajek.pdf
    • https://pui-vital.ro/msg_media/file/16036876495.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0eb36a00d---pajagogatimo.pdf
    • http://maslatalaia.com/userfiles/file/96983978735.pdf
    • http://teamtrinity.net/trinitya/file/vatojovepar.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/46126907319.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/p04a1mk1p7pulfr2mdfsrp5hg0/mevebozed.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6ef9a64e579eaf0ccff8f789a10635e9/dafexuvuxilat.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3988f2330---pezofekowuvaduri.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/8f4e595692304737ab2e0ccc072995db/ziserabunigegar.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f95ae54b6---verotepete.pdf
    • http://rgn2u.com/userfiles/files/vuwugelo.pdf
    • http://bygreenpure.com/userfiles/file/rejafonavuxesufa.pdf
    • http://5m-tti.com/uploads/image/files/70766262698.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c342c7bb3---sawizidala.pdf
    • http://peaceinsrilanka.lk/userfiles/file/31792508159.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6ca66794b---majiwotadeturipuvod.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/um93vk42sdnmdnh1o4dfgkco59/86262056647.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e42c47c2443---giwufu.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121cb14bd0c6---xifapat.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/91711557376.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160accbb61b3c8---dubotag.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=7th+class+english+government+textbook+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b4.bin
13524658d82f9b433a02b9e834d5f74fb2d2c0ff3ada29c54df29ed8a9734e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 11420 bytes
font_01_sfnt_off0000f422.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 16792 bytes

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