Malicious PDF — malware analysis report

Static analysis result for SHA-256 b679b84d2ad1be24…

MALICIOUS

PDF

92.6 KB Created: 2021-07-12 16:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4935a89c251a2427c34ac2ed6e53ec13 SHA-1: 6ab97c7cd8021d01a7e6d08e1c8948058e9b1351 SHA-256: b679b84d2ad1be248a0ccdbad6bb26a6ad091850786c43c5f786e0b4260693af
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, suggesting a link farm designed to lure users to malicious content. The file's structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • 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.
  • 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://benetalent.com/upload/files/79929245806.pdf
    • https://angelsstaff.com/uploads/file/54976293198.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa855c49de---14291963736.pdf
    • http://fittbikese.hu/files/file/74107821462.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f0c6a6e20---porusovugekuvemogif.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/90aba127b7f64192d1eff5d4fe73628c/2387916123.pdf
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/53468251927.pdf
    • http://smartwealthhk.com/userfiles/31061374237.pdf
    • http://3dprofi.net/images/uploads/file/63348611838.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/287fa7c8a4e7e4bf496499629da59853/mevadomogizifus.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/hjpgclp9ibehia1g8uts9cijn1/lukijudogakiwexo.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/819e5e1718c5749fff6f9e8ec6bbecd6/ligalopeserawixovitoxol.pdf
    • https://fablab808.com/nbloom/fckuploads/file/vidijasafix.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/f7bf6f53ee193c7d715890068a43b0bd/wumat.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fe7b92755---sediwezedezanorukuzep.pdf
    • https://spiuruguay.com/ckfinder/userfiles/files/60858860294.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1f6e04664---33766841268.pdf
    • https://kristinanamaste.eu/files/gurovureli.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608640f2674c9---59876798814.pdf
    • http://agendatourvietnam.com/hinhanh/file/5380739976.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/6301741801.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e5164eb935e35499bf10052491fb727e/jujufamiwo.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8869493083b788dc275fe67aeef797ae/vuwuzifetadelovikoxadanes.pdf
    • http://xn--9w3b11kh5l.com/ckupload/files/xijulezufiwitez.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45b36be121---mifasozi.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0c55f177df3493571c7e5268f0533f14/98692403775.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210603_2695EB5E408D29F8.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=low+carb+asian+slaw
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f230.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 16092 bytes
font_01_sfnt_off00010776.bin
451dcaa9a92437735c2fb389a42ef0a3199446af34114e8dba07c500425015b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 10176 bytes
font_02_sfnt_off00011e5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 16792 bytes
font_03_sfnt_off0001366e.bin
537f414a8013fd117c717e201ae48e1e8d1ed1f8cb0e6aca964f924415cb1734
pdf-font-stream PDF embedded font (sfnt) at offset 0x1366E 17588 bytes