Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6b618bcc21afc4…

MALICIOUS

PDF

82.4 KB Created: 2021-08-12 10:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74a97e2b1d39be77b28d553e66ecaefc SHA-1: d42a98a0f6c5cab0cba34da5844fc6642de2a750 SHA-256: ac6b618bcc21afc4ffcb60ce6f78c4e7e420d23be93861e0577df1eec25e70f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

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://jmtours.co/aym_image/files/zovunotatufewoxoxelabu.pdf In PDF document text
    • https://tasivn.com/upload/ck/files/sijeke.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/julexililunop.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55c5fe5cc0---pijugoritu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a503008ac87---direkomute.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/1977647466.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/44774896288.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751c580b109---36601871405.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a185ded8685---68773772291.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/12687584252.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/98536875726.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8160264323.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/20669323333.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb5007e83---vakunuzematu.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/39808136321.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/97289415950.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b14afe04226---4572716148.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/gaxijewes.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/managowiwadadoderu.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/4220fbabea18c5ca068ee708d11abdbc/fasifedesamorip.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be82a46996---narepelibuverilizutodu.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/4gmb9hi5q35cf2fngso4q3lldb/faboxerapetegoxub.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/74968047484.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db43ff1bc6c---65558732216.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/8a97f0c56f7fa13283ad74b3cf87e183/wafifewoxepidefebimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=samsung+microwave+oven+user+manual+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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 11192 bytes
SHA-256: b5ba0a8611fd6833aec9efa030266980d6c6d4b5e577e40676ed9f1931e6395d
font_01_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 17140 bytes
SHA-256: f621f376139f15ef6f6dd137babb41d1891fa9c569fc7b10ae8480b8b5de6669
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1