Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b54b6d8aa6e437…

MALICIOUS

PDF

66.8 KB Created: 2021-05-23 03:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4e096f9e0e891b41464d3ec331b41cf SHA-1: da59f603d4b0908c2c47b3ebffa40a271048d9b9 SHA-256: 19b54b6d8aa6e43769835dc33ebe39dba557dffa918bbdc1582042b6d655fdff
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs that point to compromised websites, suggesting a phishing or malware distribution scheme. The primary function appears to be redirecting users to potentially harmful content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9751

Heuristics 5

  • 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
  • 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://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/he4612sd71pgt8lhmg2rdlehi2/wariberudivodupijana.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1855204b81---vekonijajawoxatovuzivof.pdf
    • https://papiratisk.cz/soubory/mosisutikarebikugixareb.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab2f40a0b---98220496959.pdf
    • http://alhouti.com/userfiles/file/telekubaze.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/spk70bors61tj7ija851t3iu8o/rejefutafexurojonutufed.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608171c175757---bililinera.pdf
    • http://albino-pitti.com/pub_img/file/sitetopudorakesa.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f602147476ae15d6be5fd317b7a190ef/vozivoketifo.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/977s4fbi3cjpajqau90qatdobm/kezimonorenisofulonew.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec644b2427---davemuvazekobob.pdf
    • http://dmkaudit.sk/101/upload/file/liraletenugisuzu.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7f135dde346583f1a63c3e8693014744/womewafitepe.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a7142454696---zulofiruxawofusawef.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d9ba1329db4abd6256f75d78168c0f21/81043726947.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff77f3ad9---mufizepezegotalada.pdf
    • http://aucoindeshalles.com/menu/file/47053486784.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bb624172df73987826fbdc17e7c52684/nawigarekusubetu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=player+ascension+command+ark
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c1.bin
ad8c36b84aeb5e4bfe92b19540969d21b3fb7605dc7e2271a04427721ee19911		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 5252 bytes

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