Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f2c01969f06ead…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 09:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 485fce8f51b5a423b8cc3d5a4c64d786 SHA-1: 04295f1a56b42882a93a32cd2108c91e43982926 SHA-256: b0f2c01969f06eada77cff3ccc6a01bc315fa7bd9a08a847767d3178a78dfe99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://benthanhsgfarm.net/images/uploads/files/galamegulaga.pdf
    • http://euro-ex.net/images/blog/file/59283250512.pdf
    • http://helices-evra.com/userfiles/file/13077675087.pdf
    • http://myucpb.net/userfiles/file/negafiwurekozuvuxuvefisen.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/zunudesukejo.pdf
    • https://fceresources.com/ckfinder/userfiles/files/91322607434.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0ae51e2e---fajupasugabisisewetu.pdf
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/76210514229.pdf
    • http://hiace-yoshikawa.com/js/upload/files/73772433487.pdf
    • http://vikingpaint.com/user_file/file/25190770227.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/baxoroxiposumojumafegur.pdf
    • http://redigonda.it/userfiles/files/gorudibaza.pdf
    • http://air-con.ru/upload/files/gamekoxu.pdf
    • https://riwg.in/userfiles/file/buvawevojofirekarozugo.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/1676437216.pdf
    • http://stroyindustry.com/userfiles/file/xowetamovuzejusokobikam.pdf
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37122106672.pdf
    • https://zoldlaptop.hu/ckfinder/userfiles/files/11833542366.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8a66f744---zelitowowevemol.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/be013c154f651a5b298376e65404a247/palemixexenivam.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/pgrslppihm9svjo9s3ejai34g6/10617258138.pdf
    • http://teenmag.cz/userfiles/file/lipopan.pdf
    • http://autoscuolapezzano.it/userfiles/files/18492364579.pdf
    • http://jonme.net/ckupload/files/91963194025.pdf
    • http://villabrown.it/userfiles/files/lemuwozonuxasewi.pdf
    • http://kelsenator.com/userimages/6123493665.pdf
    • http://poiskvod.ru/images/file/71115970731.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=vnrom+google+account+2019
    • 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_off0000b504.bin
efa4d7cc56abd95cba14275003e16a248961e1763a8db87170bc9a75af8c07c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB504 10844 bytes
font_01_sfnt_off0000ce39.bin
3141e01db53fc2547ac5692a41106e904a0e814e6608ef0c95cd9ee9ed3b208f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE39 17556 bytes
font_02_sfnt_off0000fb54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB54 16792 bytes