Malicious PDF — malware analysis report

Static analysis result for SHA-256 0431a4067340934b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 17:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2be2a88d354e43d7feb7160dacb37a6 SHA-1: 913c152e5e6a86f9a547052ec9895175ebce6039 SHA-256: 0431a4067340934b73621c69de878ccc86de4e394acbbe63fee5433396cbc351
156 Risk Score

Malware Insights

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

The file 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 designed to redirect users. The presence of these links strongly implies an attempt to lead users to malicious destinations, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://prestinireedcorp.com/userfiles/files/memofovasubes.pdf In PDF document text
    • https://rawoctane.com/uploads/file/56202749525.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/13993173876.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/26422626027.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/fanuwolojosoxox.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/64477123086.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/712071afb0e8e36e03f9621d2ca61a1d/tireririmagipexupaki.pdfIn PDF document text
    • http://104408017.linker.tw/files/kevopuwaxuv.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09c08827d---76120552430.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/bepakusez.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/pejaxepizenivuzod.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131aa60bcc98---62979668217.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e246be10823f9892b2cee6c837b940e/gitugalezuzukevoxabi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404e13d5639---31497004931.pdfIn PDF document text
    • https://securitydm.com/slicice/file/lumakupikoxijimexuzub.pdfIn PDF document text
    • http://elskenecologie.nl/files/xatabazavokiz.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/310be85e3216f79c0d134cd7a8c8dd47/24572210076.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/kubazanedupozejozedizosed.pdfIn PDF document text
    • http://hainfelderteich.at/4432721442.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/nokoxotanasusarejes.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/pazopuwozoxarenujikep.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/nesew.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/68592329668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=itel+dialer+plus+operator+code+for+androidPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 10664 bytes
SHA-256: 3ac62a4e451b42f2ac7091e4b40b99cdf09c28e007a60abe54f163ac04e066fa
font_02_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 17832 bytes
SHA-256: 3e36caf09a5043002ed106ebe4cf28fec236a60514511de011cba64d99140942