Malicious PDF — malware analysis report

Static analysis result for SHA-256 e791a058ded98f8d…

MALICIOUS

PDF

76.8 KB Created: 2021-09-25 22:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0cb35b9e2748d28b5aedc2b5d3659e26 SHA-1: cf8c64d3cf8bd3b5bde2f8cab0eaeccb69078e4a SHA-256: e791a058ded98f8dba8048f548dc22bfbf0a44e587697890d30b1f1f8654deb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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, directing users to multiple compromised WordPress upload locations and other potentially malicious sites. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into visiting these sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132703cb56dd---11751796352.pdf In PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/tuvifa.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/veximibe.pdfIn PDF document text
    • http://st03.it/userfiles/files/widowutagojolezinafiwop.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a29211657e270959ce294f228daaf3ca/saruposupaku.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/nanulajifawoluzubagidaxi.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/tifez.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/xopebixaxovuvamirarokikim.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/84030604361.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/salagozesega.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/menufezafopiwowokapo.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/wataz.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c55ce98b9---xoxixabevi.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/dolobifexoti.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210901_3827F17DF3CCC377.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/dukibififabewinoxowa.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/22921071012.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/67179361060.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/51058488857.pdfIn PDF document text
    • http://sun-eko.eu/files/file/rokovezugarakewiveruvekis.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6c6bfe8a67c33efcf5c67ef031593cdf/76356903342.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/59019757803.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/feruju.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340b988a926---91841266623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+transfer+files+via+usbPDF 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_off0000c041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 10632 bytes
SHA-256: 266d38bf3b82c24e09268ba68cd74cb41ac7691b8696cc2914bfe43bafc6c26c
font_01_sfnt_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 20384 bytes
SHA-256: 8e3c68fa79bc05a0e154ee5e573ea8dfe653761ae06adf86d073acb897487297
font_02_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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