Malicious PDF — malware analysis report

Static analysis result for SHA-256 a063fba8697d065e…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 23:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3b10cd8602fde6f31ee73a2bf3499d43 SHA-1: 12c50989b7eb0f7f5841cd0874bd7eaf6a1000e0 SHA-256: a063fba8697d065ee491ecc3db161dfd225a4ed5747886f31976aa76e19120a4
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=jobs+that+hire+at+15+and+pay+well PDF link annotation
    • http://kristenpell.com/userfiles/files/28890723828.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/06vm3bd9c4ectbc9ego74asc4k/19332299991.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/gejokiludebap.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/16329444306.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/eb141dfab37f4a22da3cdf12285abdd3/34314413239.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d806d0d058494decfdaf0d99019fcf8c/38727194256.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/19414348239.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/koxekaxuzewudigo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81523bc5a---lowupodoligumumot.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/paxovep.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/dojexi.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/743941e28478799b4c21efd55c9cd5ef/71889688780.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/doreziluludemosubonif.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/3au1jcbo67sd7b2iu4vfs41klr/fobapagemeveraguretijejav.pdfIn PDF document text
    • http://kmsenior.org/file/files/80693845283.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/giporidik.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b48a03f1fd0a945493b1f5f8395881c7/mudanumi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0d4a83c3b7d1ab5566100d024fcb4f5c/sobesinazegozupuwino.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/232a89651ad049613993f61fa5e23158/bopokemukutava.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d16a321c6---89783561419.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/6083678791.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/24854122587.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/23296101947.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 11008 bytes
SHA-256: 8a010cb805871906f58d22254fe80f151ddcf7fdefab4f0f37ab3cb25183bd94
font_01_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 16164 bytes
SHA-256: d61842cf78d8eb9362f90cc2f2b70e3de8aee50a824d8f0f451e7e4c121f5ac6
font_02_sfnt_off000136f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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