Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e52e6da03fdb67…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 03:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6619cd724b119d401ca127cc638d4186 SHA-1: cd4ccc198e660277005dfeb57a8d01f39fd1ecfc SHA-256: a4e52e6da03fdb677efea1161c44d7b150c49de820321c78bbd075344621878b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=lakshmi+devi+songs+in+telugu+lyrics+pdf PDF link annotation
    • http://ceomit.com/fckupload/file/21085952740.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f07fa7f468bafab13fe6e69ee799cc5a/lelumigus.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160be5215884ce---32437342126.pdfIn PDF document text
    • http://candientushinko.com/images/file/9387504183.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/ttu08jl490apmtcrqtk95hkrop/jiwulolaxi.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210617220321.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bddb4ec96---wujirabovus.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/naxoguvadopuxiru.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/79340953007.pdfIn PDF document text
    • http://dentherapia.hu/files/file/basabawemifarilidomilofez.pdfIn PDF document text
    • http://allasclub.com/campannas/file/kezijod.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160928b4f360ce---17345682940.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/dolapewuja.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/21467401990.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e995b51230---58916132892.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/8e0m8klus2nbc7vi7bevmm2jos/93677432109.pdfIn PDF document text
    • https://isleo.com/i_photos/file/68506328434.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623299804.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ca297dc18---683886853.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/xudivova.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/siralugujigemazebixewa.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8b50cd7381a97f047f9e76f3aac85d64/69984919246.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/divejiniluvana.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/safalitujaguvowawibonak.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_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 11396 bytes
SHA-256: 079762e8f33a0e2f32b507a6f31060476796928adee47ab1d447606b18b02cd4
font_01_sfnt_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 17720 bytes
SHA-256: e3ac9009ff477fd823242f67421d374dae88bd73b4413b247d7c2080c0bfb94f
font_02_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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