Malicious PDF — malware analysis report

Static analysis result for SHA-256 79408c2aa525790d…

MALICIOUS

PDF

84.8 KB Created: 2021-07-09 00:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d0b3fbb6e46fbcdca644e62f5d2535a7 SHA-1: 6e8d4b34cc6234bc195ab28ea2ea88275c09141a SHA-256: 79408c2aa525790d645625eb8b0cf89241b4197849398cddd05f7ae0d89f4bd5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://icsbc.ru/fuploader//file/34488327266.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d4fc466e---79786761646.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/burudeludukopi.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/46315839404.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/16cdbdaebf6b2cd34e1dada0dc62dd62/10954872147.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/mamovuxumojipizunijuwigo.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/sijatoxigu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e9189c920---fadamatow.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/pumipuwefaloda.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26b44b9de9---xepazotekuneruvu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/137bb87331a160e58051eeb0cad3d705/60178017683.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/70872350546.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/bodof.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa5f19760---22755590302.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9bf09c08c1e4aceeea7dc00e869ed805/14098692575.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7693af470e361fc572289217dec9e11d/nixexibelivosupabu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/jpmob92mkm3uro89jm0tnh80r6/92264139051.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/wifojojaxumopa.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/9187825820.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/35778104332.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/88727341798.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e5cb00277b5b543462b14df350b5e256/94615567855.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/sozagobuvusitidasop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=translate+yo+quiero+comer+culo+from+spanish+to+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE06 11248 bytes
SHA-256: 5a367e0bd21edaeabca7ce9c221a867c4689ded7e8578a643411a41da925ec21
font_01_sfnt_off0000e7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off000115de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 17560 bytes
SHA-256: b1078e3184ffb416c504a60719f29b0457398a3bb3f0dcc3c1e77275d4aa8d41

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