Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1aed71d5c319a2…

MALICIOUS

PDF

79.4 KB Created: 2021-08-31 13:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9edc236271604eea0e8bc4768a2036d9 SHA-1: 887bbb74a0a52d823f9d314cf5799ed6280d2963 SHA-256: 4f1aed71d5c319a2b9d4b9597c2657bd631f4511a8fb81f7e8b6398434012509
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, directing users to multiple compromised WordPress sites that host further PDF files. This suggests a multi-stage attack designed to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076039f1af5c---rogatoponubofobebufu.pdf In PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/56c1602689aaf1be36112fd8405562c4/xudifofavekaguxafafinuvit.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/89287774372.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/03c6df08dfd08d07ca876abb67866621/52336958278.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d988486a6a30063ecda79dd904108b5b/35870277316.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dc93ae4af5c---fulerinefetubemejesokur.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec53d5ae0b---dibiligakipe.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/14419323980.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/20e958b8495d89ab5bf90efb30e6b3b3/xivob.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/28216a488a6886997e249fc70743220c/zoputaga.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/068f3b33953a9bfc91572fcbb98e67b1/52687365585.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/patopejenuwi.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/naxejena.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/2327545056.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/jd4643a5cevubo1928jgcshroj/natugasowadijub.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/tidomuse.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/dobedunenavonevetitetuje.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d4da41de789c0ee60bd52e34df420bcf/37838762270.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d7fdf930---fizimoruwuragamud.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/45447347041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=manhattan+gre+text+completion+%26+sentence+equivalence+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 17436 bytes
SHA-256: b5a505b64ffe68f24e025b5431a2c3232d02f8d1927a0c2708d3bd2f123fde2d
font_02_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 10748 bytes
SHA-256: 19ba3d244c9a3abc71fbfbc4cb621fd9d53acff9b393da3b6aab71193c41f068

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