Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51f5d5d4e051128…

MALICIOUS

PDF

92.4 KB Created: 2021-09-14 05:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0cbda0f13a466b31c88359aa8f474f36 SHA-1: 635fe342329d3f4373396c8f69cfceb67015f407 SHA-256: a51f5d5d4e051128b91497511fd9c81e8bb9a424ac182e3bcf9c89574c2c8e53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0d7e5a9f31f9c90f132d323242323a2c/41585134283.pdf In PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109100056277581.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/jepizeweridoku.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109131557024246.pdfIn PDF document text
    • https://dom-titan.rs/files/banuwefananevabijipajulim.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/retojevederiwozumaraj.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/pilok.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/lonigunegilalu.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/68687929262.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e812f16b1---mesupebifa.pdfIn PDF document text
    • https://raljob.com/userfiles/file/12154674242.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/dumame.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/83368008880.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/21512059494.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/mamaxumobudiginitenoso.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/89340331377.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/somubitofudiwuruneze.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/jexejovizujovev.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/85635706697.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe7de2c021---buxutowibazijapade.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0d48108cf0cd73cb7e34808158916750/91166423875.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/fuwoweka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mem%C3%B3rias+p%C3%B3stumas+de+br%C3%A1s+cubas+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_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001101a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101A 22144 bytes
SHA-256: c27d545d6d1399122e0a461fea953f7547c9189b1c18064a80b249e3c38112be
font_02_sfnt_off0001486a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486A 11064 bytes
SHA-256: 2615446935540dd01848dc9f7b1aaf57d97fe6c393796e654a54dc5f25633c3d