Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef388d1a72eef08…

MALICIOUS

PDF

87.8 KB Created: 2021-08-01 10:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c98927d136f6b3766bd2b7fc90ab8fc2 SHA-1: 2cde54a365f72c924c50f100b6c5a5cedd711c77 SHA-256: 4ef388d1a72eef0812b4309e37635510212566bce3a7376b016d904455314be6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://yourownadviser.com/ckfinder/userfiles/files/kavixamapakedoludu.pdf In PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/33483060717.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/3a86db91a008d3b6e1ca77398b047f28/zijugusegejasolupewoxikes.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608be0caed42e---woribofaxisomelupateduwuk.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/sonazipoxowun.pdfIn PDF document text
    • http://navigator-33.ru/media/file/98792235316.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/vijikuwonulopijodokuwalu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///33478317135.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/80324388153.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f03385629a5988b875d8972ff053565a/4832894138.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/72800707099.pdfIn PDF document text
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/87370910972.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/3pdv7p6pf3ei8tc721dn5d3eil/13569052867.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-6/20210506200250363329.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/dojiropana.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be40332f193---76620532055.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/13205664325.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/d64e2ba9f2f86b70ce618551389ac5f4/65151952503.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/e8ssdpp4k0qslpe47oisrb223n/woruxefovegax.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7eth7m5si74pap10paobk3ib12/67352074593.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/sadilafisu.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/14804547601.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4cb308429---wovodanumuzonumokepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+to+say+for+chinese+new+year+2020PDF 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_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 18660 bytes
SHA-256: c8698fcfdc194e11b3567d56ba7dc078f999f24471cbd4be4a5911d996eb8079
font_01_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 10824 bytes
SHA-256: 2efa17b4ba4480dd03e56315071ed368c2a81a72882c86936933ace3d73665c3
font_02_sfnt_off000139b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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