Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd54efb49526014…

MALICIOUS

PDF

91.4 KB Created: 2021-07-01 19:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d61b8875a00432c88c9765a23d171cad SHA-1: 6896f3d7a5797e6ac71174fe691c328925d1cd90 SHA-256: bcd54efb49526014f6a07824dedaaf13c06fafebeebbb41b1cda06f54f87877e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to download further malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/nf2hkspq6jgsaarecu2sckr0o6/pagajogo.pdf In PDF document text
    • http://omni-links.com/images/blog//file/sukujuvugibatosib.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/f7ce55c2ccb391e5ff5b809c5d2950fa/3414923950.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4580bcc63a094990b8df1d0425912fa/32798272942.pdfIn PDF document text
    • https://hgb.se/filer/file/21541323324.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/81398283048.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093661433306---68856194168.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995b47260ff---tabaxazawosovitaw.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/bajiluzabaxuki.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/wutojorixujitoro.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacbf67f88---75811576554.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f6c9ec959cea2c2d41af3deb74098ab3/49651367373.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/51998343978.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/zipovapoparux.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/12815579763.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/sibetowulojomuwesunew.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/99822386788.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xoxidulavakegafotuk.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/160755ba755abe3107107db0889897c6/49161658979.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/118dc61bf902c3e794ac316f86d8b741/joxegizozeb.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/2552b66c36fe5fde11a16da1bb3eb960/17377579829.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab93618b20a---fisoxin.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/eaab540d3685fc2d928e5d0dce52a5a1/susurazagisilowox.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ndr1b1a8c57qplgj240k692gh4/bedijefixisoba.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08388609b9---68841334441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=install+music+paradise+proPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 17196 bytes
SHA-256: 0f7ee9fe5e199a83387965776b2110bbfd7592e32b68c696ceefcb8a0430e9c7
font_01_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 10724 bytes
SHA-256: f07d5b62dcb22626ae1371e5c64f9367f2e2be71ecf25552990632c2d2a7151e
font_02_sfnt_off0001336c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 5712 bytes
SHA-256: cea23969a88c608a44e740a27a894d1d8f9abb4afe7a9380f4201950af89c292
font_03_sfnt_off000147fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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