Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de85cb545ab2a03…

MALICIOUS

PDF

70.0 KB Created: 2021-09-20 05:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c510f28ac9544ad23991ae350a11710 SHA-1: 7e75e63d16cab04a4bbde185c3f53de1c1d7f048 SHA-256: 7de85cb545ab2a032d077e290472617a196690ff508f28a752a2db97266138ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to potentially compromised websites or disposable hosting, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the structure suggest the document is intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://farsiherbal.com/cache/fck_files/file/49912635931.pdf
    • http://headlinesdinerla.com/uploads/files/nedajekive.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161416b7d43418---10649467030.pdf
    • http://mrpokedb.com/uploads/files/93151578353.pdf
    • http://ffarchitettura.it/userfiles/files/zaravexofinenozakafiz.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095dec538b---64970290091.pdf
    • https://beautifulhairstore.com/upload/files/mibuxunowasuxopa.pdf
    • https://mobilieroccasion.fr/uploads/file/52706658117.pdf
    • https://vzglavniki.net/data/file/fatabujes.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210919_191219.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613025a2d431a---gutanafabosozikopu.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/jekilusirevoxe.pdf
    • http://runnersavezzano.it/public/userfiles/file/wimafamatirugosozo.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/pisoropabovit.pdf
    • https://www.wemservice.com/ckfinder/userfiles/files/tijulajobujo.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/27342057842.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135a624cf89a---9296039862.pdf
    • https://medtek.vn/storage/file/bowiwo.pdf
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/ponewiwuduxoparezu.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/r4m8iqfm1pdtaoco4c95k4smv2/24662914106.pdf
    • http://www.drivingschool-brno.cz/files/files/lalozipigamirubomozujigot.pdf
    • https://novitas.ro/files/fomugilogajoxug.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=new+watch+online+movies+2020
    • 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_off0000b35a.bin
105516e98165f488d0dbd5aa3d2534e84ba3d7698d916d7aa59fc5c0ac67fb23
pdf-font-stream PDF embedded font (sfnt) at offset 0xB35A 10768 bytes
font_01_sfnt_off0000cc0a.bin
f67fa235fdad92341672043ca018bcdfe354bebf3a479039f38d3e5c35365488
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0A 15092 bytes
font_02_sfnt_off0000f26a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 16792 bytes