Malicious PDF — malware analysis report

Static analysis result for SHA-256 de13cd3621849da8…

MALICIOUS

PDF

83.1 KB Created: 2021-07-17 04:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 41a80f38ba869fa32874d36467c4bae5 SHA-1: f961ac1460dabd4f14cc8a58cacd2e7d2862ef72 SHA-256: de13cd3621849da89ec36237ccd0a035529523525850a850add6a31bfd1c351c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//28156309622.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/03fd90d431e1e65439a70344a79202e3/58242388368.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/92871583076.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607337dd1aace---224520674.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/bvrsotk48cboafc974au82l7p7/muvizejezinefomasujizuw.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dedb791ebc---zujotogifitexafuwif.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/62459359915.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/43580553423.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/lipukatupefasejumuro.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3caf33cf7---gajoregozer.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ba650d0559225c155971d65c659c5047/nupulovetawipofelapativi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160790e4fdb971---14000949974.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/92558393737.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822072d4294---nivisetojivemili.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/xodinumilesubo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796dc09a291---safadotazefipixulumiv.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff1d1e12a---lobowu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1505b48decb7a04a55a83824355d3d7b/fijix.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/709746580586c34bdee40d7ad2f33689/61629810126.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210614060648_gcbgs7.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/risavudusolukanosela.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/96601988990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=edtpa+lesson+plan+example+elementaryPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 16600 bytes
SHA-256: 330579fca9f2eae42c3824cf212ba967a2c3529b571403ab8eb3ed12a1060d59
font_01_sfnt_off00010ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 10660 bytes
SHA-256: 5ff3fe630b47a40178fa8e2dadce7933af1750755134faa6c704b583ce45fab5

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