Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e98745b21b675e…

MALICIOUS

PDF

70.2 KB Created: 2021-09-07 21:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c4219a61b8b3b59012370e7b0442834 SHA-1: 2966a0e5a5ec2550977391f3d53395d0e9fa8822 SHA-256: 61e98745b21b675ea124377d8d7c1c76f278b5089ce2b5791c6e87261fec623c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm suggests an attempt to obscure the final destination and potentially distribute a payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f683a246f---28948210242.pdf In PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/70983400112.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/weberovapibixexuxezom.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/5dedf5bb9a342e233355b4ec77aeb676/12257104028.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/92041859729.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077854b5f8ce---juzejozetalilamu.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/41208239554.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/d168c6fdf0172717d02c26550f5576b7/43859722123.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/gabonidudajupadute.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161069bd9786a3---4598940412.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/tizutiti.pdfIn PDF document text
    • http://opsir.eu/files/file/resof.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/99521706193.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/05c0081285ea8f9838da54d8945e15f7/bozorubotorojoba.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/zovogewisafativibe.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79ec84e741---94382551260.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/37708120236.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/tapuzo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f855281962---babomaxa.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161028bdcd6822---xodikadowexava.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/66952119828.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/70902625306.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/13b8db5c21f000a01426be9936e28099/rekubabigejawojen.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/49259252574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ordering+decimals+practice+worksheetPDF 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_off0000b547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB547 11164 bytes
SHA-256: b268d1ec5c23e2dc274ba9a0a52f9e750f05087ac8243e5293f012806f54c4b9
font_01_sfnt_off0000cf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 14432 bytes
SHA-256: 05d317da0d390dee961f8e2a4140ecb12f63d58e49402498199b48e7fdecaa72

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