Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24788220a28e190…

MALICIOUS

PDF

84.3 KB Created: 2021-09-05 03:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4692a001d97f75b6f4d64adf196a1af2 SHA-1: 741ca5cbfaac8d5eb6925c933669902ede165c32 SHA-256: a24788220a28e19047ce60d425c8efbfa3b85391a21d998dc895092d6202aa50
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting an attempt to host malicious content. The presence of a 'download button' heuristic and ML classification further indicates malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a phishing and trojan delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=management+dictionary+free+download+pdf PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0qdaavrs8e5atuvpp9eae9cc75/gafisu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ae73b6b7---75919472634.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/66800340604.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hj6tljuurajeja869ibve0td06/pawag.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/eb6pvla8jhigokvcbevmpdu7ns/60016124304.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/pewizanuzefatuvixoma.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c1e6c2a44fe86543b9d6c00c9748171/72811672014.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/74934598908.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/t5dq7tmbe6hrpvpoffp2o4mtd0/23886140099.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/xetagebulavejijipugol.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/vojaxef.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7ffa96e746b144f2fd5289d1abdec5e1/jamiwugo.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/84060534435.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/venodonoxijunuj.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945ffe24407---jibalabuponudevazabele.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076b67792171---nevefifenafugirit.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/67l62c5blcjg1if2n9m39ju522/91341872997.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bbaba40ba---tajodexotatido.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/lekixufemirisoguvu.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/jeniwomamijavosekakij.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9c6ojm2ha8bt1gmkc3hrg1dg35/89791501973.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/71722929857.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/guxepowowe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f8b781dcf---57657209503.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/81798870038.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099a64b56b3e---xikikogawinoxepipupuf.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_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 17548 bytes
SHA-256: 0cf595aa161597f27424f6d71a5a987d1880931b58b05ad2241a02faf77a7d5c
font_01_sfnt_off00011177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 10988 bytes
SHA-256: 25762d4b0f6c17a83fe3853479d96a1642e95498491de51a36ad819407f8c33c
font_02_sfnt_off00012acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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