Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2f73d967555a87…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 11:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ade29ae14c017cbc3aee13b18e994af6 SHA-1: 466e7ba8ca77bdb8d054e3c07ce9937cf0a5938d SHA-256: cc2f73d967555a875d066aa0aa509bd7e43f81821e6b4f2f56f39ec22ddfd23e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of multiple compromised CMS upload links and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=chiquitita+abba+sheet+music+pdf PDF link annotation
    • http://aydinservis.com/ckfinder/userfiles/files/viwonukubuj.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/basaj.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075982d9630e---61158740601.pdfIn PDF document text
    • https://davnosti.ru/upload/kefekugipej.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/xibadixur.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1vrb3afjsaobntiltb1a1lc7f4/tokugisanolalo.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/netuz.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16121a6ebd94a5---38325161634.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7843936c57---54044276128.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/23315277609.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/df2up49gb3csl54dr80q3kif87/85348205104.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/38263832769.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/35436174244.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/kiwax.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/xafawebufijalonefox.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eea5cb5a6---25189520599.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/97422734708.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d494c46a34---80542695979.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc6dcdda6---nipizuwagaxo.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/44837680414.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a81986c1e0---10519515410.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a1976d51---dodiwixakubevofokikewoke.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/gerileredexewesapi.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/44524456448.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_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 18172 bytes
SHA-256: c5ecb668cf9a11511a42e582d018538b66e61021b9818f8b71b085b7ceab1e04
font_01_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12531 10932 bytes
SHA-256: d9f6f9d7c3098bf1aa05dd5fc9aff5e7309306dc917c6d97db3919f289299ce5

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