Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd990ab2eeb09137…

MALICIOUS

PDF

89.7 KB Created: 2021-07-20 14:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: edea321ee4d8d91170013eea7e9da8c6 SHA-1: 9cccb8aee670240a16dd443d314a3408e8fa338e SHA-256: fd990ab2eeb09137a71de982fccea051f87e784ecd0981bdc5b96a794cf41053
156 Risk Score

Malware Insights

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

The file was detected 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 CMS upload directories. These links are likely used to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/63bee312062365b877ec4ce05dc44b7c/11884627340.pdf In PDF document text
    • https://aterhesseg.com/up_image/file/87557630384.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094637f8eeed---58762601364.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/kirotawurumogopisalin.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/5b41c8c0370a45a8a23498fb1d14b496/27746235535.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/52521746787.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b78522d6ac5---dinewuluzezajim.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d85a931cc139d894c7a5f87ab9fb6553/90788142756.pdfIn PDF document text
    • http://domplus.su/userfiles/files/xadufujeganawefo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e407259cc---28350400505.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/pq2u9q9sg4dlve00ojmadlmse3/fijuvutuxotaj.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/33113880363.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/bufukowunurof.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/tunumum.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/tutaxojokugi.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/35548525133.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/uis80v2vg2tfpr5jq5dos4ef7n/gefamonovuzeli.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/2kjac9b6f8609nsltd8mf53vh3/87007093166.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/cfa0112c68f76d25743102d3315ccc25/mobokafonawe.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///66430358858.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/vokisonarexositi.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/qfpr8njjt5cbj64a67te49chf0/34794345008.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092318610f1c---8918620060.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/xemokozuzatuver.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bad+guy+notes+for+pianoPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 17436 bytes
SHA-256: 6fdf21496f0a70e24513f929b91364444a0f1fb42398ab86507159e05db717f1
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 3632 bytes
SHA-256: e841476e46fc8b97f6f7643865ab51eed77983a63f06b89dcc7094978e020197
font_02_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 10892 bytes
SHA-256: 8a184e5a7c4f825037355fc2738664b3ca4a7d8df61d9000b63d99d3351e91d3
font_03_sfnt_off000128bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000140cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CC 16256 bytes
SHA-256: 8a40a367980032b0ef4777f86d432af181017054918c005c6542bdcbe43d5d3a

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