Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b54c98600b7a46b…

MALICIOUS

PDF

65.3 KB Created: 2021-06-23 10:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 252da03286ecb22fa1a919fe3a17d782 SHA-1: 2bc42f630c9a939f9195e8f11b3ecb9aff38e088 SHA-256: 7b54c98600b7a46b279e07a050b409883d6acdd716c4942ade7adde1f1eb0fd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, many of which host PDF files, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be related to a book title, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=decadent+by+shayla+black+pdf
    • http://nano-vip.com/ckfinder/userfiles/files/kanirulofemete.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/t7lod5na0jin19g01r4gncgfj1/livuzusazizazabulesetikam.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/eubd6q50pt0hqdlsjl3qtn8ip5/57001207892.pdf
    • http://chikatere.com/Upload/files/19851297410.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aae03f9214b---peruzik.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/cc68efb96492950c0c3c883db4e63a0e/58853575799.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4c25233a---vimenedozelobe.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc78a89940---derifuxirali.pdf
    • http://xn--b3ct0dc9bc4a4g.com/userfiles/files/jipalegebosuzetefa.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b75021a0---56613073990.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/tant1huse77aic1u13u353vm55/14351833545.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/eb3e16d22040a9b5ac65a321ec7bf1a4/81508304834.pdf
    • http://nuraski.pl/wsg/userfiles/mekix.pdf
    • http://fredericjean.net/oplusco/file/27642024021.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/8111c4997520d2a6c099037774a4dcec/30466373960.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8f868c3a86c78e8279bcd5916db532c1/91363138219.pdf
    • http://adaviestransportltd.com/userfiles/file/62675101087.pdf
    • http://www.addvanceo.info/userfiles/files/kojazuxofimaxitokinojisin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c19a.bin
52d454df8c87f763267288495d546741b66f244932752734350967f6a41dfe0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC19A 5452 bytes
font_01_sfnt_off0000d42f.bin
784483fe9e68b2dbc570736ba20e9e5a3de518592e9c9646f1e5bc69b221cf7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42F 10700 bytes

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