Malicious PDF — malware analysis report

Static analysis result for SHA-256 5497930f8e86d0a6…

MALICIOUS

PDF

77.3 KB Created: 2021-08-04 18:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 31baa42452f1f827cd7345f02b6e293d SHA-1: 55dee0b4b7e0e836f6ec87860eba02dc4266ec42 SHA-256: 5497930f8e86d0a626908a8be820a8df61340a28878a770c78b567914034db9c
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of a URL with a 'utm_term' parameter further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=deewani+hu+teri+tu+apna+banale+mp3+song+download PDF link annotation
    • http://bnblspecialities.com/userfiles/files/ziguxalirivupoboxab.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/redukoxufebowaka.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/peroxijowiragi.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8baef3cb---91571906890.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/91557001419.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/41593026122.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/0d3611e290ee6b6ea320731749d250c1/wiwabomubapifojezut.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5gog3qa2s9ijnubn59j41khvo4/taginelenewepakokokipitux.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824479eccdb---mirinedoxowusobemij.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/1045629387dd96dc2dc8e67da202588b/60787152300.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/norenirobi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c06a78c9b1c793270eed060ed7882c57/tigusoxipazavuje.pdfIn PDF document text
    • https://elemonbg.com/Files/File/12339998099.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06d354441---rinikelupaf.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/d4aae9ee28067de199365f14dbc3bf26/53976569154.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/37413922926.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607af51d8295d---bidirerawereloba.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/wenakesonegimogizeki.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/29458545379.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/judosof.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/vanama.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/xigakijuwuzi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ad62e2f7a---kovulekag.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

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_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 11336 bytes
SHA-256: b1bfa2a9332bf340ae3936e15947fcf99f1d063b07e85e6ebebc4f7e613bbe31
font_01_sfnt_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 16104 bytes
SHA-256: f270d726354618275fdaba93354f67e0714bbf298fc47f60da54a82ea28bf0f9

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