Malicious PDF — malware analysis report

Static analysis result for SHA-256 a364c9e00207dc61…

MALICIOUS

PDF

73.2 KB Created: 2021-08-28 20:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66c7ee169129cf1bfdde067792abef86 SHA-1: 474350433c72abe9c7485acc5806beb807f7e9be SHA-256: a364c9e00207dc616bb2cb064ac7988539fba93c9c477c86c991d27b6a61c5bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content, though heavily obfuscated, are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/62842787573.pdf In PDF document text
    • https://swiz.eu/files/editor/daniropureri.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/daxagevotudimuzodozawu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cea091c9a---gaxuzogenowuxobiwulowo.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607227d5e9aac---11505966410.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/5oc3rkdqci0u6h3qn1g41bufm8/75255382246.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/zogekuloxatudurib.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/48311497333.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/fc490c1e949fa14e1c0676a5246b542e/riduwexuxidusobeb.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7f3899e11---latukusegut.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202108020253379531.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe6f0a427f---tomubilisugudizasakapa.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/baxemuwawuxuz.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/82936749465.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/bumejupa.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/jopujinalutuvuxiw.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/jikodag.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/62273254622.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075703978444---1605719444.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609829ebeabf0---vepepasabanorapetari.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/44jh86j6jvm7v60hujbh08nkv4/75897444264.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0801b1fbc5---86197461297.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/87807632201.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/wojawibevipele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+intestinal+bacteriaPDF 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_off0000bdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB5 15980 bytes
SHA-256: 36b66b5d893fa913bf87809d9ffe64a6144f3a78a2c5c94ef70d288e6cc76e92
font_01_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 10688 bytes
SHA-256: b3bc357ad307daac397c5e5352579b2321cf0f981a941bc9f502ee4756a61390
font_02_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1