Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bab4cf02ded372a…

MALICIOUS

PDF

61.7 KB Created: 2021-06-23 04:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3632770514f51d341c0eb481a214d5f6 SHA-1: 8ef6ded5683fb0a618300089ac7392d8aef75860 SHA-256: 8bab4cf02ded372ac1dac7fd298ba82aaf93c6fbc8f18bd37a75ff694541ea70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs, such as 'https://garglob.ru/uplcv?utm_term=watch+series+online+sites+free', are designed to redirect users to potentially malicious or phishing websites. The presence of links pointing to compromised CMS upload directories further supports the phishing and malicious redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://garglob.ru/uplcv?utm_term=watch+series+online+sites+free PDF link annotation
    • https://classconnbio.com/img-jacson/files/13086077125.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bd285847---90607262725.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/82006216503.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/pajunijere.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/demagoxuwelakawupato.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3d5b2895a---37077957923.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160856731b9e00---numagifopefusekasigej.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/sunas.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/63206775671.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/51984721365.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/62f887730225992aed6801d492a57ed4/nakodirudezezobusa.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd25bd9ef---nevofu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/busnnfhag68f3aoqthq30153h2/nodelifevikox.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160844f4a368f1---tasalu.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_off0000b5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D3 4980 bytes
SHA-256: 12259e6677a5994f51efaedb5acc28c52d964e30627cc4199c816f1e5fbece93
font_01_sfnt_off0000c6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CB 10236 bytes
SHA-256: cb8dee88ff062af86993f793c1a9f80f989beddd9fe055edd31d35700dc0583a

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