Malicious PDF — malware analysis report

Static analysis result for SHA-256 4922bf29cbbe0a39…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 08:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9dcb44fb6dab06fb1e9ad9919d29b34d SHA-1: 1f43b73631b4e60bea0c346c5bef8dc26b9c1d31 SHA-256: 4922bf29cbbe0a39b8e0972a59260da2fd209074a16e1c61685b3127dd97b32c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://mesterek.net/tmp/96178702753.pdf In PDF document text
    • http://upoart.com/ckfinder/userfiles/files/gadorebasuluz.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/ketevipiwu.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/2dbdadf020c3eebd99a5cffd7af4854f/45215859884.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bf5732ac3c9c9e6d995021d7e1889e5a/juporupasodiripemiviv.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/jojowafabeguruxe.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/61984107614.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/sizimoxezabawozarapo.pdfIn PDF document text
    • http://k1a.ru/images/files/file/noleduzub.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/bivazisonigedowix.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/83883556892.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2b233f1a5bb82b6af6852d09ffec0fa5/23768693635.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210810164257.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/45383090674.pdfIn PDF document text
    • https://primer-spb.ru/files/files/fawisazinexuma.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210720212113.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/giwibufesisobagikisunem.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a250fb945c7---93390223068.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/vunov.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/44982504034.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/79662e7680159bf8f10c1ea2348c8a11/74654872922.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112d03507da0---77148159563.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9rpg66b7566dord4d9nocvd79r/welesodaneloren.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=acta+de+nacimiento+chihuahua+pdfPDF 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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 10652 bytes
SHA-256: 603da3d79b18126de994453237c5b32993fd9caf0d3302e28a5e4546caa76146
font_02_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 20608 bytes
SHA-256: acaad0bef15103f083a188abd1a1e06544abfbce6109b92e0d5cc7f5042c7059

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