Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d042a7dc52b7e69…

MALICIOUS

PDF

88.8 KB Created: 2021-07-30 18:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4601d675a6c703e82bfbf221c74e4692 SHA-1: 33b2af9542427ce378a1b4e7f1c7b6c160401c98 SHA-256: 5d042a7dc52b7e69ebbea304b9ac29bdbb6060606fe8734e25b9b1b19e9c9ca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nomylo.ru/uplcv?utm_term=printable+bengali+alphabet+writing+worksheets+pdf PDF link annotation
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/74fgmm8u36t67992vnsaggf493/50968563682.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/5unmd0700i0linhoe91cdt5nc7/mafurevi.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/juwafebep.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24f230d452---tadupetexunofibulajo.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/jjsjv4fk5063g32g1856bh0vqb/rodixanilufidarujogox.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zamuxulotobekaxepivolewik.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b9511661bf2---fifaroxosizedabomib.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/48198694374.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/belife.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/pejomovu.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/39501079707.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830bd686d09---28388005199.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/lototadigi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/26h22pe3jmdpsamn4vhq04bptu/bazuwapujenedoko.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/52321529.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/wexovopanipobefibezul.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becdac3a128---fadikekuxebe.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160745185c1c83---33759681885.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/migogofefimomojepeludi.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/16425183567.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/56q1jrcns3hd9guq01bl6hah0o/73734311799.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/61019168254.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/4804602643.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_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 16560 bytes
SHA-256: 2954b3b304a5fd93669cdf3b672b4d35100e21cacb806a15ae5b73e10a6caf8a
font_01_sfnt_off000122cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 11096 bytes
SHA-256: 2cdeb4ff5eff80c4339fa26d805448b3221c041fe14d673505be1c26406ad10a
font_02_sfnt_off00013c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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