Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc155ce04cb9f7f…

MALICIOUS

PDF

84.8 KB Created: 2021-07-12 22:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b423dffacba40efb90926e1b373d9f3 SHA-1: 2dea3abe78d0589f25c70e78b59afef06a410be5 SHA-256: 7cc155ce04cb9f7f4f154dc521248f7c0fd5e823b0620652a3131e7e5d6a4087
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many of which are hosted on compromised websites or appear to be part of a link farm designed to obscure the true destination. The presence of a 'download button' heuristic further supports the phishing lure. The primary attack pattern involves tricking users into clicking links that likely lead to malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ashioke.com/images/library/File/89402722023.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd29d18b24---nukosem.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6a9754870210f0433e6299244ddd7171/10267196067.pdf
    • https://airshow-bg.com/file/50738737506.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/76mrdk8916h7q1jr3spievl2hi/7657564922.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd4a00ab4---fibirabuxuwutorija.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160945ba1470cd---kobox.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822d152b266---27158166692.pdf
    • http://rahwayhigh.com/clients/42761/File/kababas.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f1423a510a53cce992168a77bf366aa3/nonamoragawugezuxugoza.pdf
    • http://icltindia.in/userfiles/file/mebazolonoz.pdf
    • https://vannordenvastgoed.nl/userfiles/file/dafefamufa.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/cbf040edba585a31d015a4c804e1ac5a/negomadevalovukutifukadaf.pdf
    • http://asupuro.com/user_data/image//file/92088227562.pdf
    • http://yorktownhs1987.com/clients/57482/File/zatenijixafi.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/196d5abe81e8c81d07ad83983368c3a0/85643534277.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c7cef60d2a3dad342258b74564958b93/50875348540.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e1b058763---zowezup.pdf
    • https://bravo-hk.com/userfiles/file/zujovapukolesubujejavi.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c69a4a8fa4851f97b6d17996f8202f6f/2685125433.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609febcb73d5e---11883488207.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/penolinojedipo.pdf
    • http://suamayin.biz/userfiles/file/34841649035.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/zapanuw.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8388ff0863a345413f00b64fe97059af/tumagexopusa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+email+a+pdf+file
    • 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_off0000e9eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 16792 bytes
font_01_sfnt_off000101fd.bin
37b03b4e74962fb2785d97f9446f028af08433a9e92270ebb9ff4c171a1b565c
pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 16984 bytes
font_02_sfnt_off00012e65.bin
6c19c8f3f8e4176dde2d35cf70ac838f147be9c1275ad94e59a48cd70b9664d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E65 10480 bytes