Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f5a619e0716dd6…

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 06:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e77803ab45e0c6f247a6c8bd49bb981f SHA-1: 9b8a0886c91cad25e1ff75efa529966f19edd72c SHA-256: d8f5a619e0716dd661fe0af6cd22472bdedf3bbf50fcee030a05ca827c7e62b0
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly supports an attack pattern aimed at redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/91d2b01bae7ff99f0fcffee795e586c5/manuk.pdf In PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/54503015419.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/53262303011.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/64b26ad343fe69c1de7d3b083ad17eda/10405371439.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/55679360638.pdfIn PDF document text
    • https://fallsplat.se/file/kifenisejas.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/16077171532.pdfIn PDF document text
    • http://shopabrang.com/images/files/zevufejadodugafipu.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109011502406591.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/tovazepufajazamoz.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/35244523591.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/bcajbq2207a6got3dt6cpcm05j/joluvinimuxarexofuvexotaw.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6934035e---38577760206.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/bazopifimeperelibamazex.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/jitoruwepef.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/82b8e0hoojol0njufpnolb4h35/29368669490.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/41179970580.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713081b138a---sigivejivexevunawad.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcbea2469a---24027987366.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/mixufovezamo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16111fc84f1826---7215886842.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210731025815.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a9ee01b2521cb48b6ad869fdaa0dbc02/87112650106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=components+of+natural+language+processing+pdfPDF 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_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 17988 bytes
SHA-256: dfd1904b1f149c149c9d0e0ded8c21a062e916a4306b598efb25a24ca5d41e6e
font_01_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 11092 bytes
SHA-256: 5dbb6e747c20cfd923ac8fd0c379743d514b5adb115c3944e78599b9d7de9c1c
font_02_sfnt_off00012f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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