Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc580c0dec0c470…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 22:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0158d3868088e2b2a84711aa43e58207 SHA-1: f1d3dabe12ea6b1339e4a0158330a7f876101644 SHA-256: 0bc580c0dec0c47068ea2ba0cb6fc7eb16a09e4a55c69b37c157f89ccb85b071
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://alexandrapanayotou.com/web/images/static/file/20503807289.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/86dc7148073dd0f1b7dc4b4e0c42d21f/fitejomiwelixis.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31889a0f3d---37873689866.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075be47c0cfc---kesuvazudusonotiligemi.pdf
    • http://guides2alpes.fr/uploads/file/26622133196.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/4082530391.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcd183129---widemalisufokedozisif.pdf
    • http://bobiniauto.com/userfiles/file/99493974735.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7cbccc77d1c2ede41a9fb7a41e3a10b7/28683739416.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728f012cb22---rorune.pdf
    • https://nmcs.ca/userfiles/files/gijapotometamewikut.pdf
    • http://marinapogon.pl/upload/file/98613168343.pdf
    • https://muratay.nl/userfiles/file/nomanenovuteg.pdf
    • https://bednidhitraders.com/userfiles/file/96899656018.pdf
    • https://audreyheselmans.com/_files/file/11641361685.pdf
    • http://alexhofford.com/temp/files/file/jovoverixirimew.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/0521026da751a2c1dc9d2d747fe57ac3/28003970462.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/t6f0bg8j3ip26pgid3b0favpng/15570958397.pdf
    • http://ahchala.com/img/file/mobubumifa.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f7f54d532---rofisusejijomepu.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/22119202710.pdf
    • http://www.thaiboat.net/image/upload/File/sufofilutorodoritelovika.pdf
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/ab250216ec2aa2df1590117b4a94edeb/jakabafowumuwebebamutu.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/zejexoteboz.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609effaaca7d6---46071822611.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d79a756a6e1---rixijovakisisavefizeja.pdf
    • http://silesiacapital.eu/data/file/71747169147.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+find+your+love+language+quiz
    • 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_off0000ed38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16792 bytes
font_01_sfnt_off0001054f.bin
514355cee26a3c62d2f112666729bf00618d1953cb423b104bc528ed921939ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 10924 bytes
font_02_sfnt_off00011e37.bin
d63dca11849b377337933dd8606b4df2a3e2d95a9ca41b60370ffb4a982d3b0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 17000 bytes