Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7ea5476e9d36a6…

MALICIOUS

PDF

158.1 KB Created: 2021-06-29 20:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cd34460a9c8443e04a4d06443b8222e6 SHA-1: 1d14f445fdc96794bf8b52ef7c10addba8b0a945 SHA-256: 9c7ea5476e9d36a64265b2eebedf2bab4d7dffd3eeed396e7b03947478c0fcf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://mmszke.hu/files/file/pegojitositebebinax.pdf In PDF document text
    • http://mbcasc.net/imgs/file/47630479401.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/paruzegeferunowiwufokij.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c917e3b173f---lavuli.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c4b86ac2f---2377696288.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/31843667261.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/682750466b6f243f2d505367470e2c06/72140888306.pdfIn PDF document text
    • http://bio86.fr/fichiers/zovomijevitizixofad.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/ladureforikefibam.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/mabosota.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/taxosapotujazefasiji.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/595cf5223339ea7b06bb2b30492ca880/29076505240.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/degulozinusetin.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eafffb9f21---wowaxogifobezexekovasizik.pdfIn PDF document text
    • http://cocoal.com/uploads/file/pitevawunela.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/77925219341.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5ertgmpdk0e17vru0q1gp45ub0/65369016610.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vog1rqbq0s2fas9pems0scnbe1/poladuzo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c6ffbda9c0f85da7e5338923f28ec8e9/dukibupikusewalawum.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/bdbed6185e90f62b1e48f0839c0b9fda/majabexe.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/92244224718.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af124bbfb20---vilafelobin.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/vunifevilod.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f219a112---19631614625.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/21672625ecd715411529af0d7aa83990/64120194117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=10+examples+of+monocot+and+dicot+plantsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21397 24084 bytes
SHA-256: 88d2c907bb05632ca0d07f1b7195bb30c966437d9e56248ddbf189799379f8ca
font_02_sfnt_off00024f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24F96 10860 bytes
SHA-256: 5c86aca169cf469bef845a6e661f9c6f0e80d3c77c12ffc425d9bac4b1a89934

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