Malicious PDF — malware analysis report

Static analysis result for SHA-256 9987f3ddb7e152eb…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 21:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa23dc90c4df51f701ec9c99df6201c4 SHA-1: 68e17e430b53eaa249a44a637deb5bfaf5a50a28 SHA-256: 9987f3ddb7e152eb32db5d80da0ffdeaeb6ce0405e46fbb0ba321b5e05d8e44d
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, likely intended to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b67d0e19---tawaramojesanekojuketit.pdf In PDF document text
    • http://inbeeldt.nl/userfiles/file/79760357804.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085667c50458---wobajirisovagewuzelawinen.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5917b9e24d---56931605305.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/verevajigilixapelumoliguv.pdfIn PDF document text
    • http://araonline.hu/uploads/file/64001630031.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/12399764256.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/cf39d73baecd2262624f26375e7ea002/54248503231.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/11523930302.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/23e787919137d25ec6fb71dd956f086e/84651406043.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/41058075653.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/19596798532.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/14564204616.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/44359756745.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3c30701a---71969719890.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/36059030785.pdfIn PDF document text
    • https://marigabung.com/contents/files/wuvasevozo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3d88a2e5---nazeso.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/4150064055.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/kks7vio5rrfka9kgb3bpog493i/35846448950.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16084206ee4e09---34283133661.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ff9e656e615fd5fcfdbf93fbf0a0878b/52286163066.pdfIn PDF document text
    • http://hncastlecable.com/d/files/92807699264.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///57365758673.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5e58686c95893116fd8af4ffe1b56850/pufujogekipiniburunitugit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tivoli+audio+model+3+manualPDF 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_off0000cc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2D 17508 bytes
SHA-256: d13adb92b33ebb2d6a04873767df4f84b95ea12d20cb200d308097d5cd174d5e
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 10344 bytes
SHA-256: 9ddc5bb9d8b266860753d205b1fc424b802f597293fa6e0a87f67771ca64a769
font_02_sfnt_off00011145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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