Malicious PDF — malware analysis report

Static analysis result for SHA-256 d462e27ecffc3fd4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 20:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e19e667ab51c9df7ebbdfc1bbac418f5 SHA-1: 93b3c7f2a1cdb474b08c4b8dbefda120ca088b7a SHA-256: d462e27ecffc3fd4609eb63e04cc5ed7dcfcce13e1e6b2fa6005ab6dc65ce463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the malicious intent of directing users to untrusted content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://nomylo.ru/uplcv?utm_term=2011+honda+cr-v+repair+manual PDF link annotation
    • http://sattamatkapatti.com/userfiles/file/fumakalar.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/xoxeg.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e631b66c21---23497914282.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/24952802105.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/gawelopexanivezuwimil.pdfIn PDF document text
    • https://masihpt1.com/contents//files/wakutefadujatume.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/nomikepizedolovexebarir.pdfIn PDF document text
    • https://mytopics.it/uploads/file/jikubukuwemewule.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/56529523513.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/91130410332.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///tevuwufoke.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/nizusa.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/55868100872.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087446936f31---93546540179.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/65531990485.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/fad8f492f64d489835c815022b45f9d6/66310810428.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898df7dd57d---34393509215.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c5f7e5732704fddf9fee1739c99f5283/26053891328.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609374fba104d---61073223593.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a518a0b3ea---vinodaveluboxenepoz.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/gokizid.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/853a413a3294f849f27ad3f01b722aa3/13521791542.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/77992d05ac05c51add87aebc17350258/sabakenekit.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ab2ad693140d1dd57404065fdfc7374f/zopabi.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/70836106306.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 10912 bytes
SHA-256: 6833c5f5940b829eb1d84dbe29343ede9cfe62d8b808c55f833ce342cdff51b8
font_01_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 17848 bytes
SHA-256: 160f60e49131db56b93dd9e07efef6d3be20ca24e846002b165a81d8f25076ea
font_02_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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