Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3a307f5495f3be…

MALICIOUS

PDF

127.7 KB Created: 2021-06-26 02:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f044238ff3f31870edbe57d258d34762 SHA-1: 86c03b716d658eaddf4aeb016d5d18981e32305a SHA-256: 8d3a307f5495f3be84701f8513468bb6fcdb43dcabdef38f399c1b5a226ca588
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded within the PDF, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=methods+of+design+of+rcc+structures
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/40621953573.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160959ce780656---sodasarumojodolixupunevu.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/00b4b26c9668b7851ab3357117f495e0/sawubamozojagigigemexi.pdf
    • http://www.toptehnik.si/images/34815896305.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/07941ac91bd18cda8cecbd6fb260ce9c/fogorutupivaponeda.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/84874881176.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a93bb7aa28f1f99e8cadad76693f802b/98459287308.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079304a6b206---14467181426.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ed3b28c2b26ad1402d92e1c5a64ccb4d/34126795988.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/kebos.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ceeb9ab48---vetujugagetodaz.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8tsn7ta2avo912g5njlmeu9di4/80615652730.pdf
    • http://extracam.es/app/webroot/arxius/file/71729510908.pdf
    • https://lasanisports.com/files/tatunafaxepas.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a191e89c37d---sozavamafejolemim.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/75ccdb37ab1a4d253bd48444f7ceb27a/xuxub.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16093f36eaed6a---34955973887.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/40b4a04856c7d9b573381f448166e42e/vugatanametoges.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608960ba3908b---momamu.pdf
    • http://cropscipublisher.com/files/upfiles/file/80454736508.pdf
    • http://arch-teh.com/pic/userfile/68548287369.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/da01128643504ebf7e2cb7d5c9d05d9e/sujowuz.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001877d.bin
8c4ef27e84080ca71c95d8d1e2135e16fae1ab96867ccc582008fbfa1bcc80eb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1877D 22172 bytes
font_00_sfnt_off00016f57.bin
577b71e984d00a538bca7c70c6f25bbae829545fdb884c27988a2e7481e2a65b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F57 10640 bytes
font_02_sfnt_off0001c305.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C305 16792 bytes
font_03_sfnt_off0001db16.bin
99d87ae670de37579614a1dd65d8cd19bc449d9482173e08dcb3943e9e8f046e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB16 16152 bytes

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