Malicious PDF — malware analysis report

Static analysis result for SHA-256 37831ac28dfd03fe…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 22:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03731f3f715e53da52c21edf5a172fa5 SHA-1: ef723be4bd28e57064f09b903321a5eec5cfe029 SHA-256: 37831ac28dfd03fe177752d43c1505f20095fed888054d65132eaccaf5df0f3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host and distribute further malicious content or phishing lures. The presence of numerous distinct hosts and the use of UTM parameters in one URL further support its role in a potentially broader phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8f5d34f50---5669111869.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/715a799060bb8bc981e6c31f5946fa5a/sisedesoletexifiwazokini.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bd8hfs0u4gpaja4022obfhl0lt/kovatuboje.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f003d2bcef---71094984996.pdf
    • http://kaitosushisb.com/uploads/files/votogemonixumosunor.pdf
    • http://bogieclassof67.com/clients/71235/File/19479759195.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ef2b92d269ac434191c7bd4704354d35/renubotimifonali.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bcdde9cf7---82354536604.pdf
    • http://yomamasushitogo.com/uploads/files/punusovobolebebezokunabi.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608492d828467---jopugenokadurivi.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d33589bec02---bawakivabotas.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c553959a---sixudisosozesimazamilol.pdf
    • http://rotarylaspalmas.orgdocumentos/file/72481330030.pdf
    • http://maxidmum.com/images/upload/fck/file/89023671050.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/9b4fdd29a226288315a550a96b07d6f1/79984343094.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/78dc1ec149eb08b61522b3f1d0b548b8/78634156697.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/rq3cjrup2tfkvlfn7bs5ocm1v6/58218805259.pdf
    • http://www.anclupnapoli.it/userfiles/file/gisilevamobusetunoxaf.pdf
    • http://chinalabware.ru/d/files/75252809015.pdf
    • https://ovalpolycoats.com/media/libeduwonimijofiw.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5803926bb---kisosesepuxotod.pdf
    • http://luberoff.com/userfiles/file/kamate.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a076103ed---lenorebovutiremekez.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/at7g60en7pbloc63uajm8vovi5/90831905186.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8d87799c67c63ebab8a25527f8560091/fusonarigosaxomez.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef314a526a---sugabuzowepam.pdf
    • http://tamker.hu/userfiles/file/98616384978.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+hunger+games+2012
    • 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_off0000f0d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 16792 bytes
font_01_sfnt_off000108e2.bin
cf59954309b76d9a25baa793c10e18a6f19187a35eec92bee0d51f31c7fa492a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 17248 bytes
font_02_sfnt_off000135db.bin
f6bdec800977b2ddf1e562476f2303fbb7d89b9914288cd4d59da40f00955588		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135DB 10556 bytes

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