Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9552c506ae79d37…

MALICIOUS

PDF

77.0 KB Created: 2021-08-30 23:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a9d2f630301657bfc923beadcf5b15c9 SHA-1: a028899552d40ea0897c9807fae4677896952b59 SHA-256: c9552c506ae79d37afc4004ac22b3845f2041b417bd7a1028dd9f224081ec243
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The presence of these links suggests an intent to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://irlanc.ru/uplcv?utm_term=multivariate+statistical+process+control+with+industrial+applications PDF link annotation
    • http://irk-yoga.ru/upload/files/xovoruparaxizep.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/mepuzik.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/36439418300.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///97999644910.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160924e2e995f4---wogawulikoxumaz.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210614_1EFA47C17444ECA8.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b5ea6f36d---74392805746.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec998bc1a3---25644224189.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/69658772258.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/39132313828.pdfIn PDF document text
    • http://vititanon.com/user_img/files/vokekuvabapododuzevo.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/vowevizinivi.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/33881551957.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/puduvuwer.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/fbf4153dcd8fdfc54d1e7da2485d68aa/42870381579.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/ruroxuv.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd7c992438---61966098949.pdfIn PDF document text
    • https://protrialse.eu/files/files/33382505956.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9350bf24ffcf48fbfb09f0982f659755/40256466555.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ede700c01ba224ec91eea17fafcb8006/midejozemibakefan.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/0hno927e9gd46fm8pbvu5n39m4/wofok.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/wuposuzodafafewibenewi.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_off0000c6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 10856 bytes
SHA-256: 6b05dcae41d6fe0a11a27f20352e84389d04d2e7ff375fbd47626ac5c6eb4c43
font_02_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 17480 bytes
SHA-256: 5667a2dd8ddb8d7eaf0fbae23d2a1075b6ac70ae21820ed665c89ab5a99e0142

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