Malicious PDF — malware analysis report

Static analysis result for SHA-256 4560250a9cfb453c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 20:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3999d68cd5b155b7f2255bd58d5d3de5 SHA-1: 07fe8ed5ff5fde8f7bf47502f2bc207830e2b092 SHA-256: 4560250a9cfb453c90f545783d5d1e4124cb7a110621b0c50c824fad4f114565
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable domains and compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the primary attack pattern involves directing users to external malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://irlanc.ru/uplcv?utm_term=identify+the+independent+variable+and+the+dependent+variable PDF link annotation
    • http://kalmi.ru/upfiles/files/51966771548.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/nudinonuw.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/64496995427.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/n9tab8ke2ksfsq0c6gbve5sggv/wiraw.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/904ca3d4f424310ffe3fa870b5f8bc8d/godeboromixefozatoxupe.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/xumipigamenuwopitalul.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/a44v53str30o80j5u03q10r8e5/pebofu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9cca7bc6---xopibiduzepapusulusu.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/4802306207.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/62584672668.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ea2d7d03a---vubipinivejamip.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/patogafibetumiziku.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/62686249241.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/fimedozujodufajevutosatan.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/51945307779.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/61301550023.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/8295999318.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/jenizasikopoxalo.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/89569677772.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///11995782977.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824ecbd56f0---36810841206.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/06bed9e21be1fbda0fbefb3fb3cfa34e/galixuz.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_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 18184 bytes
SHA-256: 50a0ee7ca86e212be2dcf995a03fd00b48811e17f8cf1119d40032e7f8e9993c
font_01_sfnt_off00011436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4D 10576 bytes
SHA-256: 10272ae3a52d3ee180324abd65cd7853b59fda8a1fbd2b8e0aa051395084229e

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