Malicious PDF — malware analysis report

Static analysis result for SHA-256 a564d96b9439264b…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 06:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36cc6eb827daf4b97395024f0f332559 SHA-1: f3aca46c7e14a1e0e76823a8bc3ba007e8c945b4 SHA-256: a564d96b9439264bbd7f9f77fdabccef7934f2ad63c64c8529cb2e4e371e898a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=bhrigu+samhita+book+in+gujarati+free+download PDF link annotation
    • https://suacuasathcm.com/uploads/files/53775001769.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109151449461231.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315c9dcd88d---52164273491.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/duvofanejapotur.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-15/20210915174955331619.pdfIn PDF document text
    • https://tigapilar.com/upload/files/kotefadarexokojitas.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136851bf2de2---bemasamowel.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/54233255479.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/68e1hdrb1o48b4m4883cactr33/60098842128.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/88193842730.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/kuputomasiwaximulomupofir.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338b40c9f51---3601243920.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/14331400858.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/linetipim.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/a3e9f019bb8e0d02bc75d273512c467a/80950980293.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-10/20210910104514308019.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/pulatidigebaxuzexaxiw.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/32166107596.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210901_F56561634A0DE779.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/41063050619.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132b62a36e01---25183598539.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/96753766595.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/tuvuv.pdfIn PDF document text
    • https://yifff.se/userfiles/file/xesok.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_off0000b53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53B 17444 bytes
SHA-256: 3c94eb7f8afabaf4907f19eaedaabb3800246573dde8951ae2ab8eebdb0db26e
font_01_sfnt_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 11404 bytes
SHA-256: 2300865b1348be1f27c3e7100d6b5ad9ff6b7fc40d264822b8fccf3b4500b053

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