Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a1c203704c36ec…

MALICIOUS

PDF

92.5 KB Created: 2021-07-01 19:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bce6e4f319e9a004dd2e4954396bb4e SHA-1: 20e9028d0b4d2ef708b894c6ab6b8e0736661ce8 SHA-256: c1a1c203704c36ecdc28b161af087b5d5440b3aa67b6ad742dabfcaba9ee1012
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 an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/c751417385b234e3dccd227173049d4a/18712677208.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616a482e83---62716821369.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7c645a64c3e08277101ba799379e77f7/zopekevilum.pdf
    • http://eaas-journal.org/survey/userfiles/files/rixixaxaboxas.pdf
    • http://aite-materials.com/upfiles/file/27531509163.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce52b53b6---bumejikefure.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609306b1120d2---gizikedazan.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4gdasi9736jj76bcihoevsiclv/95441753538.pdf
    • https://knurussian.kr/DATA/upload/files/202107012203097890.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075104fc4035---zarojadobajogimixoterego.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e25104b2a---99416900081.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf8d673a3---wugonakelawuzafasakaw.pdf
    • http://verduciautodemolizioni.it/userfiles/file/wewanagipujojarogoj.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a6adc9b8e08---75397567915.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d30f641632e97496cdad65e02e8b8d0a/17641969213.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/jo9bggpr1nqrcr3af16sj8nd03/94853460402.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160759e2b6df5d---bigutoxanopu.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9ba379de2c8304903dab3510becc7af7/20828372021.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb6697135f---41387949319.pdf
    • https://aucordechasse.fr/vosImages/vejonirelozuge.pdf
    • http://elcampoeco.org/FCKeditor/file/zidikerixazi.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b0b0aad41660ea2ede952b42430e90a7/sokaxusagolibuvobutumik.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b9365ccc607---34890742037.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/a669f689b67f25720977929ce2b69a97/69018445578.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cod+waw+zombies+discord
    • 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_off00010154.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 16792 bytes
font_01_sfnt_off0001196b.bin
64be107892af4070179d5f85de2bcdd403d0b7989225fc6e2ac9adb2bf2d25d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1196B 10600 bytes
font_02_sfnt_off000131bc.bin
155253c461fe29fb1500c87a2ae2cc99268b78e104cb0b281b09865193bd3eeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131BC 19792 bytes

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