Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55b727bc1efaf67…

MALICIOUS

PDF

79.1 KB Created: 2021-07-03 01:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a25e8e9939a24480ae4a32e68a677ef4 SHA-1: ef0d5b2a0a4744d78c88eb0718c92f8279e339b7 SHA-256: d55b727bc1efaf67b8752ff7fc554b488cc6712ff5a7287dfa2ff8e9364a6918
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of external URI heuristics and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://anandtouristcorporation.com/uploads/jijerodaxowuvi.pdf
    • http://grandwatergatehotel.com/upfile_hotel/files/4289364289.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417bc64d24---38036081484.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/035c7f522b2344dab0c85eb12adbd3dc/49283304232.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d8fbe7e0e---41001547478.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d237cf361---60644067838.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/9f98832faf9d7ad643be26672d347844/gezozefeparawos.pdf
    • http://gerocuki.hu/user/file/98834663120.pdf
    • http://caramelitos.sk/files/tetuxerebeni.pdf
    • https://corpusbg.com/files/fck/file/jakaf.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/34e268b0c533a16ac4de5a5151349d2a/41086797106.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf506f3971---24031937583.pdf
    • https://alnahamgroup.com/userfiles/file/zafap.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160833a79b34ab---43549886684.pdf
    • https://eberli-medical-supply.ch/upload/file/vinafipesezol.pdf
    • http://asja-doll.ru/userfiles/file/16231801525.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/78251605484.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160818e06067ee---bejosofezuzajizidulit.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/1h8q28i4in7ti0ficvn4g7ba6n/35492629426.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/888kv5p43sc3216gstaepa1urm/zemugepuxorome.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/05982925e23736ae9760da9a6f2908a4/15827737339.pdf
    • http://eprdel.cz/userfiles/file/15578924817.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084987cbdd88---84143832229.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210610_60E10487364C7633.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947b60cfece---73182686171.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c073d4a5cb5---61011233243.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=abcess+in+mouth
    • 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_off0000d228.bin
d60e577ee9090ab7a7f4d38cbc7c427f6f33453de84a1fa57e4daf6d2ccb34a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD228 17436 bytes
font_01_sfnt_off0000ffc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 16792 bytes
font_02_sfnt_off000117de.bin
a8ea0d6978c25e569d421e59773d29855ca64b1f9271bb227700f90e3aa0fdf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 10408 bytes