Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f36883d6ffcff5…

MALICIOUS

PDF

104.3 KB Created: 2021-07-15 22:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d092ac7fbbd145802baebed6d338da58 SHA-1: 8e78a22aeb623ac4eb3f3619b053e1ed2e21dc8f SHA-256: 55f36883d6ffcff50f9d7860af9520f0845823c180b2a2b7d5f767d6f6d4e359
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/02634abb31d2664e5ff1e60439bb77a7/sefofisimuxigofatagaku.pdf In PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf439b130---59045749507.pdfIn PDF document text
    • http://simonide.org/userfiles/file/97598331765.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/966jb1m9hgv9i04g8b1094slkf/pabofomajineluzaxer.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/48979375892.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/17252321982.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725b120c861---lixojinot.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/10398942342.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06411c2be---ligofi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d22f112c64584b2b563e57cdeb0b93d3/92343456655.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609d61fc7c20f---53834752143.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/p7trjrsfjit3hfgpv7qrj2ale3/61254120368.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f9148e79cfde649ea72abf0ea13549e1/raxaji.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/wuvofera.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52db38cf2---41994200521.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6b86429a---xipikiwukom.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/55d28a79724382bde99a13618b73e756/wudedefabediduniwa.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608610b8015b8---sazatoxu.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880755e9163---77708424471.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1624a04a2---koparebogiro.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/99095939416.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/20495215191.pdfIn PDF document text
    • https://angkalaris.com/contents//files/timapunenijerowalota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=liver+and+white+brittany+spaniel+puppies+for+salePDF link annotation
    • 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_off000133c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDE 11056 bytes
SHA-256: c9bd09d09011c23026b1d83a6ba3a603cdc4a9710176e68ad66f83dd66de9101
font_02_sfnt_off0001655c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655C 17800 bytes
SHA-256: ded9f4d665c99b88885ad00447e2668b5ecbb5b70f5b6d66071ee07f6a0e6dae

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