Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6fb731d54df408…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 19:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de1319ff4021e2e5e2f5144c28c470e6 SHA-1: 8478998765ccf68ca283ab2927135e00802e1c2f SHA-256: 1f6fb731d54df408c900234c0168599c57ceaf08a0060673975c6a8b0ffd7b02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to distribute content, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/can5q7f5ap7adrdm6uom40hfgg/wafewotipi.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa222b2842---93673260533.pdfIn PDF document text
    • https://blokhol.com/upload/files/72110703639.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106190149.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f4c06e99a80c714ce1413d403056ee8e/bupadaxofareduvab.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed4546a711---90811728867.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/98294747614.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/19155995889.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088782dabf08---79752250732.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/15964739946.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/53557696770.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/dexosalelepotuwuzawose.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a365a7a8e---22053127309.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/46459591645.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/f5e214d7deecbf25e7650d93b0c063f4/22897707179.pdfIn PDF document text
    • https://arerp.kr/data/file///78705177943.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/43381075007.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/fnq5q4b3vnbqe9me0cl0ltqnst/67224514862.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///bevagunupuxoguxusozopexu.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/peginapu.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/durunug.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161249e4bab84b---newinakesazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=apprendre+le+piano+pour+les+nuls+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_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 10472 bytes
SHA-256: cc02d1d4b515dc4b3875ecffc7499e7a65b40d4c884ff44deb2a7ae39e40283a
font_02_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 23204 bytes
SHA-256: a68cace8369fb6e9c5d61ece6800f42e3e5f825ed3c5a35e43143dc19ef5afc0

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