Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7b3c2bd3eb83ef…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 02:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 83c8c34172c9c9a87e92802f7b80c680 SHA-1: c51e9890508fa8f6c4547f773b5c9631af1f69de SHA-256: db7b3c2bd3eb83ef3d464baa04ec2c7e016660765a75cf021cca593952af784d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=employee+engagement+activities+pdf PDF link annotation
    • http://thuduchouse.vn/pics/file/netajubanunapezidotamo.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/75350240752.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/58712474759.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/87967084191.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c30da6cf4---84629922526.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/bc834e61403357552f720ff378d62bd1/72314208105.pdfIn PDF document text
    • http://ore-processing.ru/d/files/gesafizalit.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/vuzukebiritekokozejibuni.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/dexizonibizamos.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/30520162795.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094ecf42e7ef---58658582014.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/94191285611.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0a204073f---42230972258.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8iup287vthd7o89nlj4hpobtd4/83713255438.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/tinunumesagew.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faccffcf9c0---femebojimoxopotenemo.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/53881871411.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/83234155977.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210524104648.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/wotevuwijut.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/74441932b4d98e20df90a58571ca85ec/zodomaxuwozuwomenineto.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/92009150920.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/92215768261.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5eff876d0a87d6044ae61244b8685591/kigotasagegu.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/votanalexizajamodot.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/79895065694.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/5dabc3e8758468538c5b3fe23eb9d823/2456722779.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_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 17192 bytes
SHA-256: 9a9f0f4933490d38b0fcc19ef440ca445355495c0f60373ee329fe2d4aafd626
font_01_sfnt_off00010bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 11024 bytes
SHA-256: 21b8e9a424773453260c3a517c07a45a5ababf770466ca9fd0127bd3240aadf6
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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