Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42f3ddb94a64f59…

MALICIOUS

PDF

87.1 KB Created: 2021-08-22 03:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e640f96dc4cfd0ae849f1fea7c3c5f47 SHA-1: bfbea3d5be3e8ec47320e126a4b23bc84c766e24 SHA-256: f42f3ddb94a64f5951796b049198e0778792cad215c14d119252d0fcbcff17f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://study4student.com/cache/fck_files/file/77246101333.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090421aa6948---84874349717.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607999d48d6e8---48309380013.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/0qjtmohgvhu9vdkvjfgjim6t5l/63422763653.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa81276580---36273485251.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/suvuvarufoximofizuwuse.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723d63e0dc0---88973419088.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/jafafuraloza.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/27813635531.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070137bcd1f4---foranem.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c99fde70a6---72358854018.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/9427629590.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/93921490204.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/d5vd6qp692e70283jpnvjopp81/36924812736.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052102063412.pdfIn PDF document text
    • https://apra.pl/files/file/jexutala.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160927ffb6172c---xetaduzowakis.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/075468187a9e6cbb9bd861c490d497a7/zeraxanam.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a6c2824d03534b7fb40335cc51a1fa52/befuvepewakarurobofepi.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/kovunanafomaz.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02baa0bd66---21672914161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=for+the+king+early+game+tipsPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/4575230444.pdfIn PDF document text
    • 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_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 17616 bytes
SHA-256: dc2729fd095f148c1f16623b0bc2242e347ce829c484b340011bb5d78260a3ba
font_01_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 10884 bytes
SHA-256: 912c1daa19730b9d0795ffe7fd42174a428b68c6811c1c55e20a1b966e4bcf8f
font_02_sfnt_off000135fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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