Malicious PDF — malware analysis report

Static analysis result for SHA-256 37639b74c4fea64e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 00:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0ded2dc02595279b71bc611f3bbe811 SHA-1: c4545f7e8d2c08d53684afc35d5fcb9b0b146fae SHA-256: 37639b74c4fea64eb5ea8f99e19c8d5d1b452e81995c73b21781ee1e25dc1d89
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous unknown URLs and a specific ClamAV detection (Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0) further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://hftyby.com/upload_fck/file/2021-8-16/20210816034943263908.pdf In PDF document text
    • http://abwpetersburg.com/uploads/files/17740136855.pdfIn PDF document text
    • https://grouptm2.com/contents/files/sitipofidelofalefiki.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9e74a1216c8ed19e205ae740e01c109f/gafovomakolaxibo.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ad778451a4df29cf98d4cab4fca5ca4f/koxuvanutovijar.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e280d0b7793076daa5dcb5e38b27e8a5/mibajajirawarenazef.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab7001b9d---13364741109.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/fekofinapugisazete.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/zolaruzewafujejusep.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0184b592b---bevodurokininodumatet.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9640799e6---89376484911.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/57559087610.pdfIn PDF document text
    • https://lorus.rs/files/viwofi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f35a6d8e664---jutogawe.pdfIn PDF document text
    • http://linza-market.ru/upload/files/8515280944.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210724_145535.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/kofaruwarupujujuvu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd393203df---54412554053.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/kidurerabigetudetase.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/256ab87a4cc23b97c8ac47736bebd35c/23749871049.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16114654fd56c4---vejumi.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/fmmcd620aq1td6fnm7ajvlrde6/basoripafudamab.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ec74a6a55d6d9d207bf12b7d68ed63ba/leruwivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=english+japanese+picture+dictionary+pdfPDF link annotation
    • 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_off0000de20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE20 11224 bytes
SHA-256: c0cd0bd9e9f1720415ffe46e5a914b9a7b3634124230952bec3a2be79cf373c3
font_01_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 17796 bytes
SHA-256: 0ccd9c3e2c1e9051e346821616402fef656b526a01a2f592ad3c00a74fb5c696
font_02_sfnt_off000125e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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