Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f8becab86e42c5…

MALICIOUS

PDF

75.4 KB Created: 2021-06-15 13:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a4c11fea6d15656aa083bd0d2fdefe54 SHA-1: e724cb4170ff3d509e52b1f93757e4b4971dc48d SHA-256: 87f8becab86e42c5f7cc6fd572daaa38513129f960161b32a5f60faf731eaeba
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm or phishing lure. The embedded URLs, such as 'https://huntic.ru/uplcv?utm_term=futurama+season+8+episode+1+watch+online+free', are designed to trick users into visiting malicious sites by impersonating search results for popular content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://huntic.ru/uplcv?utm_term=futurama+season+8+episode+1+watch+online+free PDF link annotation
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099acb2267fd---sosogarude.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/fufipujevugeginapezagana.pdfIn PDF document text
    • http://fitviewer.de/files/file/9756463405.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/30f4o0qnuqte40kq7e3csafme4/90586152938.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdec9321b3---wolebatofojopolo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/e6q37iio16ddstuudgnbnft586/76545075114.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2edc17762---bixefusog.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/dosalogelupe.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/172e510b1deaad1980fe6371a90908d5/gizerovu.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/0521026da751a2c1dc9d2d747fe57ac3/28003970462.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b919bbeb428---53447373265.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160871d11c8988---67172204742.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab87be3807d---xoxakowezigazigenaluwamo.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/funixejubilog.pdfIn PDF document text
    • https://songhong.info/userfiles/file/61196048200.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/kabotenumanaxinel.pdfIn PDF document text
    • https://mytopics.it/uploads/file/mukewevojegaloseb.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7e0a510a8---xenogumexasejaga.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_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 5688 bytes
SHA-256: 4312b70725608cb6763d88f4192dd57fb236e372e65953edfa71d27a1db1b12f
font_01_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 11328 bytes
SHA-256: 58cda632af605422f3c01289faa380dbc66ccfcaee4dccd57eaafd2160a665db