Malicious PDF — malware analysis report

Static analysis result for SHA-256 6625328f617c8911…

MALICIOUS

PDF

159.2 KB Created: 2021-06-25 17:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b672b42ad367480475f6950ceff8dac3 SHA-1: 4d7145290d46bc938888778f249cda21932bfffd SHA-256: 6625328f617c891170562496cd0e8a7d66947b12790b70330be58539581e3d7c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially untrusted domains. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9334

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://bbpartner.cz/userfiles/file/bumiwegejabijewon.pdf In PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b097440a9---71123749380.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f532d43dd2---73483705901.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1854769566---dezoriwopiridekew.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607832bcccfb3---21316165273.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/55a2b1319dfd8e67726e8554c0cd5a3c/68543463005.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/81377423647.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0273d47fef---39876313393.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/24d35b53307402eba776a6fc85e9b129/piwiwowotuvozupiraxuwug.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/suwebupebisaluri.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/nusajivubekifiponigina.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/31028186037.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada59852be4---jowis.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/tojemamozevupuwobonirezod.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/8e01ece1e0ac18dc59646c90b2024f9d/vogefufufatusibezujumewul.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/87974558594.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4ac9c7be---pilexef.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18bce61fa---sovumizo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9095543bc76fb55778f13c32918f9a7d/44309303085.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c281f4a26a---79728621444.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607156bba927e---36590422315.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/15182033200.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/52573485851.pdfIn PDF document text
    • http://sukhabalka.com/files/file/26556305384.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/cf6dad327f32f9c9059d56c853be53da/12238620125.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c894ea877b---tifusugojevefekisadilewal.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/71282821412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pantone+formula+guide+solid+uncoated+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 17056 bytes
SHA-256: 3b9f9c6ca4bb30a27937f1b6a2769a7da694569377aa12ce9197c851bc01b49d
font_01_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 11064 bytes
SHA-256: b4272492b1a1164d0b19851efc288e2fb37cb07ea2e7d6c70ab42f138e6e68a9
font_02_sfnt_off0001391b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391B 115200 bytes
SHA-256: d2301fb027ec8f60b0e29d468b1b92fec163dc60352884631c62e5ba73c3db64
font_03_sfnt_off000254d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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