Malicious PDF — malware analysis report

Static analysis result for SHA-256 544b2a0af8de5acc…

MALICIOUS

PDF

93.0 KB Created: 2021-07-03 05:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec51c4e6686d488a83ef60045f88df5f SHA-1: 60b40f3fa7a7dcade68d6e09ad991cc95135772d SHA-256: 544b2a0af8de5acc4a361961eeee7ddfc576f5d5985717525fa85ddcafc9d3fe
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://circuitvietnamcambodge.com/hinhanh/file/lubenokomisan.pdf In PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d08e0fbfeda---80857381649.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/4a66b253426c70523eff55c6be6ca351/wosaxuwejegenovepelumoni.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607bead1d2afd---sevajowiduduzerigeneva.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/70a8fac544ab42f787a0943bdfd115a4/tirabifag.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/47489196653.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/066f218ffd9815392365bb8877e343b1/83400899338.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/nivasevudanakisezebivu.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4cb01325328b778b91dd6c4acd587ab2/zoxobanatifegewomapom.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97930d1e9---miwujaruvojedemuteberesa.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160847a55dbb7f---rafuwefe.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0789f125a48884f1cb6634c515f3a484/33081652177.pdfIn PDF document text
    • https://efnnma.org/files/file/66518836251.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/pewekipenavag.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/8ce55792e0f5f469f5747552b06331f6/50683257479.pdfIn PDF document text
    • http://amandamaitland.com/images/file/24029050960.pdfIn PDF document text
    • https://arerp.kr/data/file///kukokadikemovegujufep.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/16870906495.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/malexifezuwuw.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/kozafizomodinoso.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0191be411---gojexibid.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/fobizax.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe49f1ea73---lopoxelus.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/6d75mtf4fd21njj4d1h61tqpms/muwajutojilapewijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=falling+sound+effect+freePDF 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_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 17392 bytes
SHA-256: 6dcec771bdf356b28c7acb6b2a80ad09b9192735f47157004cd30feda548b6c1
font_01_sfnt_off00013635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13635 10728 bytes
SHA-256: 5a449867ae9b2702fc2ac0488cdd00fc0e935af4dc26cf40fb3b41e21596ac0e
font_02_sfnt_off00014ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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