Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef12aded435a0ad3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 06:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 499d8d63e85ac534920f5044c1747d30 SHA-1: 7c1a62cb478f58e27b08738d81487c889650c8c2 SHA-256: ef12aded435a0ad3c11387ab486aad0fab3165a164a392161e471ece1701d4cc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://queure.ru/uplcv?utm_term=meaning+of+sabbatical PDF link annotation
    • http://terremeraude.com/userfiles/file/88641875770.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2610d0cda---zexalabidisubereliguro.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/mapirujoge.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/40da1f9e8715de53e09c66c5f82cbaab/43954227170.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc0c55f42---betofizoromazu.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/vutekuweketetefax.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf81739be---78428016902.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16095dfc35aca9---92210163863.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ea81e6b1a52f8cdfef6a90c8d4006640/duvazabubasan.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/19195079246.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/72977172288.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/oa9qkd236f5l42sn63mo8ia6i1/39738492319.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b48dff080c1---97150094468.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/xuvozesorazotanofofizij.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c701cf97c---28853048588.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5524_20210713045032.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd92b5d81d---turapoledak.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/49826742169.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/38154360995.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/63014021047.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/fogixolugonuxosaru.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/xuxesof.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9043b75a1---21806901304.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/wigaxawubuwonad.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/71080615454.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jf6i09ckn8p07csva8a6bgqa8m/16097466546.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/63327564394.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/watiritag.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_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 10544 bytes
SHA-256: 07a2643cf056cc0a9626306e6a2eee715a26a6a9eea714ca3759a749479462d8
font_02_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 21520 bytes
SHA-256: f4da9c844611c1dcf69ed0148e2b737ff42ae60544e70d00b0f0a7cd7b94edef

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