Malicious PDF — malware analysis report

Static analysis result for SHA-256 916f6c7c35041426…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 01:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c0581db2d30c44f8a72f1d9a9a8a7e76 SHA-1: 5628c439f094171b052687539056781ef4568ed5 SHA-256: 916f6c7c35041426f783d943b74487b834bc538f6a3fc123cbf68572d1a498bf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gramercy-grand.ru/files/file/nejudidefitusewi.pdf In PDF document text
    • https://sharenkon.com/files/nezanawebowutuwawilofaso.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/73912195507.pdfIn PDF document text
    • http://asid.rw/userfiles/file/59316580725.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/xirexakikogaxovedudug.pdfIn PDF document text
    • https://luminex.pl/upload/file/48716993056.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb28ae3152---rovimujizo.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/89241057386.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/gifemobuwesa.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/0cb37ff9ad8e6315770d9ea18748c1c0/63787236953.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/34741735935.pdfIn PDF document text
    • http://cycling-software.com/files/file/67846814137.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/5309222871.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/zezejixoluvilosidekapevob.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/38075872367.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab2d64d4fc---madobonavul.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/51722256213.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///47492933557.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/k3glqli90v48f2mokelgdsi7c1/petataxevawoni.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//fonazubenomepevezakuvomas.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3ac33415---zewigogos.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/kadapilawuni.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/75113397515.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/51214552855.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2603f71f76d87a87ae07c870979aeb27/wefamaxaromo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=schistosoma+life+cycle+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_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 16972 bytes
SHA-256: cb04781f94ed663957361c1723a008d9f67d54bbb8ea8da9fb608aa3d65b9b98
font_01_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001255b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 10868 bytes
SHA-256: a4920834e6c04bd1a3ea6c84f363dbad5c5d76eb3d70b045571cf685372fe7d6

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