Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59daad7665a5e6f…

MALICIOUS

PDF

84.4 KB Created: 2021-07-01 00:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 012d8f7ddb8443ea25f3f19d10f8c9c7 SHA-1: e2152221ccb987e72dd7bdfc77c95046fe95c82a SHA-256: d59daad7665a5e6f4b866488adbd63c4e2ec73c34cc431f7248dfc578856070e
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tese.in/ckfinder/userfiles/files/beruzegafo.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/af2e5acf74b30acf162795c774c1f335/64202460476.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/s5utft4hbl5sbeokhmgkj27ug6/73848258147.pdf
    • https://akapacha.com/userfiles/file/lumipa.pdf
    • http://lltsg.com/uploadfile/file///2021061921453319.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2ub4lsp1jabdm3b7i435tnfoo2/90112843890.pdf
    • http://blackhorsesc.pl/userfiles/file/917186619.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/v8kuddbs5du1iifqr3ggkquujk/rurorusovi.pdf
    • http://veterinariogiardinelli.it/userfiles/files/daxezozuwosudogudavefud.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096206a99cb3---90304352065.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cf78948adef---39491791403.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/cruhfaqp505sh47o6hraikpugd/labezavukava.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/51451568097.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7721879d5---pedaf.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7478b04135d8b1c3d3f49fb2e68881aa/sabajewufejimerusewizi.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076da0fb8019---kuduzeziv.pdf
    • https://cakenepal.com/userfiles/file/99882413444.pdf
    • http://staresecurity.com/userfiles/file/lonusiwixefisaloza.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8ca92fdbc---88264181457.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-8/20210508180652752364.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/023867aa6bbd92a1dd9c6849361e6b80/jileto.pdf
    • http://erdbau-rauch.at/71181042155.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2a0049473---paweporokaxugebibilukapa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=real+estate+photo
    • 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_off0000eb5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 16792 bytes
font_01_sfnt_off00010371.bin
c854505b18f225e5cde8fd286ed42304760551e97a467f28eac1227262e8e50a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 10096 bytes
font_02_sfnt_off00011a24.bin
78e672cfe65dc8195ab1f524d76846f68ff2dd2581740b6a66004f91d8b8134f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 16424 bytes