Malicious PDF — malware analysis report

Static analysis result for SHA-256 319730f6e465c44b…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 07:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1cdd6682e7bf16bd1261aef724cea32 SHA-1: 28302d21d99be3f4b54f1c02fe9cab509559c07e SHA-256: 319730f6e465c44bbf58bbef04a6569f0538f3328736c568e68b34afc50e20b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://maximaviajes.com/FCKfiles/file/93312296435.pdf In PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/wijajajadosazeviseso.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/8960019443.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/16723144083.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/79710873585.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/nujojomon.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9hai5428hl8q1vlc8deouus05a/21621870582.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/migaka.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/p44ukuk7u6anflrdel8rj7c4gc/62458493516.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/69344128184.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/kelovutudurakamuwiredo.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/budexidoxelaxazugo.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/23293003346.pdfIn PDF document text
    • https://network-italia.com/file/36072904360.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/zufafofapidave.pdfIn PDF document text
    • http://mweb.cz/images/file/xurip.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/letimedazejidegi.pdfIn PDF document text
    • http://whatdwellswithin.com/file/40162077114.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/vefubananinojomixujav.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1f46710e28483dea1e0cc69fcaf56dac/75556523585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=planner+5d+apk+full+versionPDF 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_off0000b88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09E 17192 bytes
SHA-256: 87f8c3e27435a4797e99259bd795651e9ff5d342dfa5b3a19847532b934de7a8
font_02_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 10788 bytes
SHA-256: 9bc1a8ceb12c5aa5037df3f6fb930bf589e68670cb3e36694c0768fc23b98e0c