Malicious PDF — malware analysis report

Static analysis result for SHA-256 005b71a711c112f9…

MALICIOUS

PDF

86.5 KB Created: 2021-08-18 17:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 292564fcf4015ab7de134be5ee4c3cc3 SHA-1: b79dc862b701491f625d0ef98048664a924d9351 SHA-256: 005b71a711c112f912510f33cc00915200e91e7a9d315e4b6f4396433b2344c8
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution attempt. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baaningdoi.com/file_media/file_image/file/tesafegipizawezaxo.pdf In PDF document text
    • http://rotang.net/userfiles/file/87220539294.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7bsgi116ps1sq0a2o9r172i38h/gelitabepaliwujubisoro.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/51067623485.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8b579a1f5736fcb098ca020c695beac4/subujosi.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/mifalelukopomotadusex.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/30181135860.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/11382078224.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/bca91ae87b48d47e33da382200f19e28/molanetef.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/93637750491.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/dc536fa133bfaa14281a3c1b8f627546/77211274537.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/44869197474.pdfIn PDF document text
    • http://damutech.kz/upload/2021/08files/210818072014720878wenl1.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/zotofa.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/41345247295.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/5278551464.pdfIn PDF document text
    • http://abc-tel.ru/data/File/66653874907.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/teditaginarugagefuvebuj.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/bekelejifubij.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/35116116130.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c324138fc8f---boseguxati.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6436f5868d---10063131493.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a0d55fbd6---75714813108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=process+control+modeling+design+and+simulation+by+b.+wayne+bequette+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_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 16320 bytes
SHA-256: 44b8e04a21abbdea183596cf9d00387dcc0bd6f3e24ec109847708ac7f394c01
font_02_sfnt_off00012e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 11616 bytes
SHA-256: 2efd000fca5b066d53c90f14b3f61fd2b63883e6bfb237e36f192bf1b5542db1