Malicious PDF — malware analysis report

Static analysis result for SHA-256 07566b58cb3b91e9…

MALICIOUS

PDF

92.8 KB Created: 2021-07-02 02:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec40896ad0e8c31528a02fba1fe6564f SHA-1: 153f142b461b0d343febee4ac4170e99cc896ce3 SHA-256: 07566b58cb3b91e906136ac8a10874b32f688c136427a0975126d7be830b5e29
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/ca6ad1c2e5091ca7224a82282c5cb427/bozefezagufi.pdf In PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/9592c65281e1ac071de305357326a4c2/59555177409.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5c4daeba911da5b0d05a8f379cc2e732/39551549849.pdfIn PDF document text
    • http://ipceurope.com/assets/file/tinowugivoso.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/na6bq02livajjv97t1mkcmouai/pugikofaxere.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/20430762456.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/30078210492.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0392e5f4---39968233551.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/69301737943.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/125f58eafaf8d2b9d44a4a210d4f3d3d/nulor.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa56e09efd---biwinovubevot.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/19085921041.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0227971a---katiximovutu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f3e666a36---68820230582.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/zevutalamufevepomudowoda.pdfIn PDF document text
    • http://asfalon.com/__files/file/bujejit.pdfIn PDF document text
    • http://cwesp.biz/upload/file/bifekaluboxibuxaje.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/wanebizi.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/xorenodenoxibunul.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160cb07f200d43---54458435591.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27fdec6b57---55517132667.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d44a10b03536fa158cb1b174975cdebe/42377346175.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/27347869935.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/vt8jbe2pk9oac9c8c51bkjsha6/ketizijamovetedofajoxipex.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e2599133a096eeb3349aca135d73fa2e/xazuvudofonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dating+a+guy+with+a+kid+in+your+20sPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 17096 bytes
SHA-256: 989cca71648052ff13c76f2c45a3bce9b2d12730da7b882b8b3c50e92dc94607
font_01_sfnt_off00013476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8D 10984 bytes
SHA-256: 8c8c5cfa43954007405c057475b43422b32693cd282f2c64a4d2e0155de725f3