Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1546458cce8b36…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 02:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8af589f4e55e15d7fd3b572921e0e157 SHA-1: e57897cc6d082ae2731e94e6fe481a7236dc6ccf SHA-256: ea1546458cce8b364fb5530dcb322c0f676ca673a4a68deb7147558082ea331a
164 Risk Score

Malware Insights

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

The 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 domains, several of which are flagged as potentially compromised or disposable hosting. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, and the document body was unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://travelspace.pl/userfiles/file/29344563078.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/pqsh97hbvboq3l6mm0i6jupaf2/72757347182.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/dipaguvazorerefewelenizu.pdf
    • http://topbuild.net/content/xuploadimages/file/87020450331.pdf
    • http://whuntex.info/userfiles/file/lodubuxovukowatapibudoj.pdf
    • http://hoangduy.vn/vn/files/72006736007.pdf
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lotujopevobobasedubu.pdf
    • http://gallery4walls.com/upload/editer/file/refapukivisan.pdf
    • http://4seasonstours.in/userfiles/file/55492919177.pdf
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210911115751.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f18c9863ea---9843775160.pdf
    • https://aslplastic.com/ckfinder/userfiles/files/gimulefigarovitapedafulo.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1ea008e27e897e85ae9ac3a3cfe01cb/luwibivebozusevapimi.pdf
    • http://dezmaster.com/userfiles/file/kizixavenelemagepupor.pdf
    • http://studiolorenzino.eu/userfiles/files/zixodiwimadewu.pdf
    • http://jjc-dev.com/userfiles/file/jagenawubofupupiresof.pdf
    • http://lindendirect.com/tempimg/file/88315173075.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613b705839798---15946418899.pdf
    • http://twtqedu.com/userData/ebizro_board/file/niretibepux.pdf
    • http://velocimapper.com/webfiles/file/312539569.pdf
    • https://stallion-international.com/userfiles/file/20756147012.pdf
    • https://preprodpcb.com/userfiles/files/12752239289.pdf
    • https://ww150005.linebot.net/upfile/files/20210913014642.pdf
    • http://studiospazioambiente.it/userfiles/files/45161572264.pdf
    • https://psychologgia.pl/Upload/file/96023891236.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=final+fantasy+tactics+android+controller+support
    • https://lapdonline.org/file/gofumarajofesudaverejogil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba1.bin
7ef6012693e32269d2285c3c600cac2e87de9cd21cf890243e11c01d66afaf0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 17936 bytes
font_01_sfnt_off00010a48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 16792 bytes
font_02_sfnt_off0001225f.bin
3e1c4aa3880642b5acad72569514ae3d99022762e67896c9c2b99fcdb56cbd56
pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 10804 bytes