Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffff1abb169eebca…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 14:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d1faafc9f201fb385da1382208c2ac8 SHA-1: 69346ea3c4dd13e0d9d15c13a9d80b6aeec84687 SHA-256: ffff1abb169eebcaa1bed4eda303983a5c2dd15430926e91c5831a53ef6c4d11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://drafthe.ru/uplcv?utm_term=notable+horoscopes+bv+raman+pdf+free+download PDF link annotation
    • http://toanlinh.vn/upload/files/fojofuniwobop.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/xemidol.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/67800193947.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/madimut.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/63261704007.pdfIn PDF document text
    • http://mousike.it/img_ins/files/91208898323.pdfIn PDF document text
    • http://forti.in/userfiles/file/dotetidarisuramigulevo.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/7thftuc3n2mlhoffbs5jo88i6i/84109726760.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/91899808695.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/20417894633.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e11302ebf2b0d1b398c32f2c4a5210eb/3989827968.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/dujifamif.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/zilugureloloxik.pdfIn PDF document text
    • http://hidropro.hu/upload/84157092921.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/36224700281.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qid2p8f48m52el9up10nolp029/40776794579.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8ed5049f15073f285dc5931bfe706bd5/73511715857.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/34718242514.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b2c41e9e5---malutekexulede.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/168585709060b7c67c638a7.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/bizivasozovif.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/7ee3bbb71ac16a3caf99eb6bcc654887/31219771287.pdfIn PDF document text
    • http://metallpress.info/files/91593877894.pdfIn PDF document text
    • http://sireny.net/share/files/pabivejojugefupula.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/67049181583.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_off0000d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 19024 bytes
SHA-256: c99d98c8fa73ef616c2cf851aaac6f84b6c0814cfdd97d9f3be494e0546f833e
font_02_sfnt_off00011fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 11064 bytes
SHA-256: 44f106328dc589ee4afb9a87a100c3d7d01bdbbc4994abbef3872a61ef5b4a48

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