Malicious PDF — malware analysis report

Static analysis result for SHA-256 331aaf67efe2cd5a…

MALICIOUS

PDF

91.8 KB Created: 2021-07-01 13:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79e696703ada28c5cf21e81a4cf3ea61 SHA-1: 45fb12f17dc72b65d49f797d7a397d1480df801c SHA-256: 331aaf67efe2cd5a14caa33c75d9d24a7c539e4ce1f17a65458408cba01481f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though obfuscated, further supports the malicious intent, likely for facilitating the redirection or exploitation.

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://queure.ru/uplcv?utm_term=2004+acura+tl+owners+manual+pdf
    • http://bogelaipigeon.com/upload/file/41923285606.pdf
    • http://minhanh.com/files/kewirelanej.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00643b793---52601027825.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac973cb2810---relimug.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c1a9be86d---94337871807.pdf
    • http://fredericjean.net/oplusco/file/sonedigu.pdf
    • http://cuatro-pr.org/sites/default/files/file/zulerivapes.pdf
    • http://flightshop.jp/images/blog//file/91259363735.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad059ea6cb4---pamenufufe.pdf
    • http://majorpropertygroup.com/userfiles/files/66606490430.pdf
    • http://daphongthuyhueminh.com/uploads/image/files/18091329459.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f94b61a08---82256784311.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c56cd74ab---baditagiposeguxaxur.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609b353ea29cc---pawemu.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/16968884193.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/f1e5d0c6b11b555e2ed03f071ca97f83/xotagabopofefekixoxuno.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kavanugoxizijili.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077202a1d5e9---vubufomixabitis.pdf
    • http://poltinka.ru/userfiles/file/69624051492.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/3po8msaqklg4h5ir7qn7o2qtv7/53914804250.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093d42cf11bb---sirisebuxuwelonutibefim.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaff857831---rafajef.pdf
    • http://cs-web-design.de/ablage/userfiles/files/roberorejog.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ea.bin
2782565956ebe8f3d39c12447c225684895b8ae54678a78d66d42b6aa3c45496
pdf-font-stream PDF embedded font (sfnt) at offset 0x100EA 11100 bytes
font_01_sfnt_off00011af4.bin
7630e0695299f3eed4168db01bd7054cd9feb6e1199d64134a21ed564031a863
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 17260 bytes
font_02_sfnt_off0001483f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1483F 16792 bytes