Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33d6b1b53828fec…

MALICIOUS

PDF

87.5 KB Created: 2021-07-29 19:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd56e8ea80f0f35acf3f6140302a606b SHA-1: 166392664fb9821599e1cdf45f6b011094a3722f SHA-256: d33d6b1b53828fecac1759b9e3e091ea1f58931a139fca72147777b7822cf181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this, indicating the use of compromised infrastructure for hosting or distributing malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/j1gd9snq0ikib2gh9cs4lhenmm/kukerazuluzebaxor.pdf In PDF document text
    • http://j-line.ca/fck_upload/file/kiredo.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/73485720376.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/pumopamekolufepur.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/kaxudovavuvoj.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/aeba678159530ace2ad1bc493a995ced/werosi.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/dejiji.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429142421559942.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wemejiwanirosadawo.pdfIn PDF document text
    • http://hkalc.com/userfiles/20913668386.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68ededcce---vokiwopuxilekajug.pdfIn PDF document text
    • http://elm3rad.comfile/98873400438.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a145fd0544---jovenusoke.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/kebagexixisixazonorexake.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/b5tvm63jujhi918ct40ai7cob6/70258241778.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085f9da871dc---40707472378.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bf0c3a420---mimevoxuwupuxozifonisob.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/rigokekafupetele.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/winatisapeziruvirim.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/93879828846.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f281151c5---91983642128.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/65744900207.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094b10fec2e3---xavuravilukadezifi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4f3b903c3ba7269218b99dad36a80f38/37545428200.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f1ae3ik5aja0cfh37jgvoqvuc6/fijixutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=menschen+im+beruf+tourismus+a2+pdf+downloadPDF 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_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 23216 bytes
SHA-256: 460ef1b6dbfbb356b08bbe6abf1340d44a3b8b7b5e615e05d9d3fad0af8d3aec
font_01_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F2 11324 bytes
SHA-256: f43a2dd159c9c00502397d68471679950b4173938981ef31ef57446a9944deae

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