Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ad45fb0ab959a8…

MALICIOUS

PDF

82.4 KB Created: 2021-06-25 19:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e0a17c45f88118a029f839af880e467 SHA-1: a32fe60c1ba8abb8b3aff0d8c0d4b4566c7e3a42 SHA-256: 99ad45fb0ab959a8e611c298393548455a9b160543bdf3fbcdc51c3c8b2f7be2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress installations and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=gouy%27s+method+for+measuring+magnetic+susceptibility
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0593c7d7f8---91319678031.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a16a5359f---kapitenewajav.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d7095b2497df96677029124c47886b24/41687624725.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/25m0qvu3p8fo3bf7ml135choc0/7667379923.pdf
    • https://stef-nancy.fr/upload/document/93490594618.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8e89b8d130dd0b07251da2c3792a24cb/74823737844.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0e62cbe44f4e05c7f323ef35f2765c0a/29852652923.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vsmn9j9n694q7glcn56idk86n6/buxekiwizebuwujeket.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9df41f29b0d952b56aa68a5d7dece77a/58841967103.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160824601990c7---duzog.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8728b34d---milebufalorapagiwiwa.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/31245609042.pdf
    • http://uptownherndon.com/uploads/files/17615356847.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e108d4e0d---2423449950.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609d454501a86---64433441712.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccdb94295---91385318645.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16096c10c916c0---pekevobulipe.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8832a33d---rokuf.pdf
    • http://goref.ru/files/file/81816841200.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/dfggpho40eqoch1ekcfjca3n03/rojexajudegepusor.pdf
    • http://carszana.com/image/upload/File/44614481105.pdf
    • http://scamps.biz/userfiles/file/likiwetebamaguzabu.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/5046317562.pdf
    • http://dioceseofniranam.org/userfiles/file/67438402645.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/5fb9e3b9346dcadd2d1b25da92ba6ef6/tozadukajatijasogilu.pdf
    • http://asianmosaicnyc.com/userfiles/file/fitiz.pdf
    • 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_off0000dac4.bin
fd219a00c3f14fc8b79c33db3502b36e714b3caa193416c9ede5913562319f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 17572 bytes
font_01_sfnt_off000108fe.bin
df794a347d6d8f3750c836fe1e7a2f3ce00f1c29b14f89b319a246bba960dfe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 11492 bytes
font_02_sfnt_off000123ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123AC 16792 bytes

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