Malicious PDF — malware analysis report

Static analysis result for SHA-256 10087e439cfde075…

MALICIOUS

PDF

82.6 KB Created: 2021-05-05 23:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 26583837418e231e1cd466e0b5fb7312 SHA-1: 96cd9283c3053445a9ceeee088ac118b7e2bdf91 SHA-256: 10087e439cfde0758cb830829439fae7e00a14dc1a8728500b9135ccf9b2b2f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious and contains numerous links to potentially compromised websites, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to reference game downloads, likely serving as a lure. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/uplcv?utm_term=assassin%2527+s+creed+rogue+ps3+dublado PDF link annotation
    • http://allseasonsart.com/uploads/fck_uploads/file/82758010559.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160777e8849828---6455025879.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ji5itr01839k8pqq6qtjeu0po2/julozegefu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/zajudexejutibuvi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f73340876---98893200103.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/eb50aa3f5e4be8db69d11be1c3890655/55615410077.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4b25e49c3d75ba30a67a301b2aa89fa9/mujixiwelusisen.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db07b251e2---65589169712.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778c5f7d226---figovomizifofebozase.pdfIn PDF document text
    • http://alkanboya.com/files/file/%5C/fukajarigofetujimu.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e183bb50d4---67024669301.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16090df4768be1---12387503210.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/jmh8sd681e7l7lut66cua9m8li/giximegalawidetinoxise.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9fbfb541ee60ca6df7b2eaf006ee4368/defumudafalalepiravumuzo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e9ca8780f6e13e054b8e71cdabeda812/73902027445.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 5568 bytes
SHA-256: b7bdaa53b75af169ae8f85ff073e1bcbe0370491b6cd6b9900aa3a35d79f9ebe
font_01_sfnt_off00011528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11528 12984 bytes
SHA-256: a6d005583e3b76f0e0f8c6c732bd8c6d5b5f0573666e8162b5073d3d85a16b0c