Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae41e335fa2c9c0…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 15:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1710b21323bc4ddb7014d6e6b967c3fc SHA-1: 629f9b4e2ca35ebea317a0388b40e595b427a08a SHA-256: 8ae41e335fa2c9c05b11e7d7675d29b03df5feb0bbc0ee8a181788b2eba37d92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with 'screen+logger+android' in the UTM term further indicates a potential phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://smidgel.ru/uplcv?utm_term=screen+logger+android PDF link annotation
    • https://rosanaalvarracin.com/userfiles/file/13671862835.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/jasigutowefugakoduwipowu.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/miloxumalimo.pdfIn PDF document text
    • http://poliinc.com/upload/files/kejemurubiwitikenenuwus.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109080112311965.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614137d4615bc---piferesedumixi.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/dokewivoxusokerolo.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/subuwepetulasevirawe.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c51ac008d---54544020149.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/89144290407.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/lixibesitavovukuz.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/litoruvinowejafubetito.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/titunox.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/58665521296.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/jiferefolatomamufep.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc5743115a---23846723233.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lk0ho1dflkbjt66vtpl4alqbj1/20451264003.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/649953278.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/wujoluma.pdfIn PDF document text
    • https://brakos.it/file/salokix.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/pubadiz.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/delife.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/38994143274.pdfIn PDF document text
    • http://ebus.cn/up_file/file/zubusone.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/zexufofiduwetoxa.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/pulikinakurigedanitedovof.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_off0000cbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC6 10352 bytes
SHA-256: 728983ea79b9cfb2ec1f7afaddd260dcc5bc5a92127d09f5fd65d36730a8aa69
font_01_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 17516 bytes
SHA-256: 0bed104acef5e3398b7e2842c26997c2ded9facfdd156e47542453e017aba95a
font_02_sfnt_off000110a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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