Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a65fc4f92554fe…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 06:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4205b1db89c842d57759f579a04d8eca SHA-1: 259bdd6c66f81c0462017ba377232998dbfe2f6f SHA-256: 18a65fc4f92554fe65e55fa2088c7f1692896601997a54bfcab463cda2c908b1
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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=beyblade+rivals+apk
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8cb8a40c---xeregexivodanolinedud.pdf
    • https://tssch.in/tssch/application/admin/uploads/file/42605907933.pdf
    • http://jeanthompson.nl/ckfinder/userfiles/files/lutegugomob.pdf
    • http://siamsankyo.com/Uploads/file/lubarusatalilug.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613017db82db4---gudixivagupinimoxibi.pdf
    • https://balarampurblock.in/ckfinder/userfiles/files/tigelixusomekasagizos.pdf
    • https://kaptenhoki.info/contents/files/subuvotijosuja.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff83180a0---81622985066.pdf
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/dulexekop.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/40831599816.pdf
    • https://czus-lukasa.sk/userfiles/file/lifenuwewoxovewejemapozum.pdf
    • https://ht-cooling-j3t.com/contents/files/25688858982.pdf
    • http://bdnchem.com/upload/files/kawixoronirexur.pdf
    • http://3qbuy.com/CKEdit/upload/files/xejoxiwepog.pdf
    • http://ig-einheitsloks.de/medien/file/bowidu.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/mapuvelilufurut.pdf
    • https://lengthening-sldf.com/userfiles/file/80869734961.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-9-14/20210914101735406120.pdf
    • http://poney-club-romilly-aigre28.fr/userfiles/file/samerumi.pdf
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/86780244304.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/83271154206.pdf
    • http://kpdb.org/userfiles/files/9499593989.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/eb70cff0098e9545c77a2d15b5ba4de3/16305685817.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613115876f0b1---36216470429.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/befenakomoziwiremofid.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_off0000e636.bin
04c732eca6a096593c0022baffec6462d2e0aa745bed6356c940b229d6065ea3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 17096 bytes
font_01_sfnt_off00011246.bin
f0680e5608f067fed3959c95ddd51d20ecc6dd1007247a3d65f3ea13170bbfe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11246 10528 bytes
font_02_sfnt_off00012a2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2B 16792 bytes