Malicious PDF — malware analysis report

Static analysis result for SHA-256 336852ab47ec9f48…

MALICIOUS

PDF

76.6 KB Created: 2021-06-30 18:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d1a57a83e0222cde0048c9ef24facb5b SHA-1: ca9c24df4fdfbdc981ee9f19659ac83d61a7ece2 SHA-256: 336852ab47ec9f48a701ccff27b646cc2d7eb463a359c6f1ffc9c5fcad032ac1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links strongly suggests a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://queure.ru/uplcv?utm_term=why+it%27s+important+to+study+history PDF link annotation
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a81fd0a02---75499742214.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dqaakev2fqc3n9k0cuia0u7765/95076643488.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876de16585a---16792099485.pdfIn PDF document text
    • http://slsnn.ru/content/files/74521239119.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fkclthllaoe97vlgd49siri341/97916457522.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/rurekagasajosotojejowuwu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m5pcm2c3u9k1goc001cu712d14/31555397751.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f93074f4---43629577456.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/obd1kshcdetetodnn1vf76dspj/lezipefefazulal.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/14e586d0540b83503452a45157d48d95/tevetofavarena.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33734cb33---zelidomifepif.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba125c5aec0---rogoregupoverafatef.pdfIn PDF document text
    • https://micsys.in/userfiles/file/64541586774.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b54464c8---28788901267.pdfIn PDF document text
    • http://amandamaitland.com/images/file/rotepitubesukakipoxukop.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/0hucio541uqogodevkpt3p0frf/73940129529.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/jatirarinesososibuwe.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c2a9dbcd---96008328563.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3450341814---ropug.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/25285165653.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/1fe9def7ac14bf41d6b229bca5dbd963/79700552849.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef1bc490d1---dotutelaxulubog.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca958a937---nigidixa.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/xirorivamakolivo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/bde102bb0166b57983aa317ced20e52b/75772168876.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_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 15876 bytes
SHA-256: 8fc2cb83695a7b5624820d3681ca9a4aa6f045faa27a676513a941cd0c532dd3
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 10720 bytes
SHA-256: df6083af0186629634c6b984e093dbccf6927f5ec77c8b3fae7a1f8098cb2c2a
font_02_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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