Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cca0a64dfe3235…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 07:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d825df4dc9834585327757dd8d92ea4 SHA-1: 07b691e20243d6b46c774f153fa1d805b16a8066 SHA-256: e8cca0a64dfe3235f8c5a7299246f9e6cf719258e46015191f6fade08b422ab7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the phishing lure. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://infrive.ru/uplcv?utm_term=deshabhimani+epaper+download+pdf PDF link annotation
    • http://surmounttravel.com/userfiles/files/77650725979.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/85472180813.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/92037068455.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/75141827002.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/98944024372.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/49353347900.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/tolojajaxa.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb89ac950b---81787202543.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/30415305450.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/2485076536.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/61154161004.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/vadapuwefiripafujixi.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/93068413808.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/88822690333.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/dce4e14678d953256a1ceaba43acdec3/zozewipijozigixu.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/jitena.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/pavifele.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/16961625012.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/63699499388.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210624_066E32DD522BE5D5.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5e9941180---96722338446.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/fhrrmnifoe557mvuo8p4pbuudv/lemafusakazava.pdfIn PDF document text
    • http://tencanpowder.com/d/files/tikiw.pdfIn PDF document text
    • 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_off0000dc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 10892 bytes
SHA-256: 15cadc367ecc29f56a3ce9db9cd0a8031537aa90cb1304a57675cb09aa0ef785
font_02_sfnt_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 21460 bytes
SHA-256: f6e5f99163b0b9744c35478edebc7f2ce9c9d14858436fde95d31dd38fbc62e2

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