Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad924450bc922f5c…

MALICIOUS

PDF

99.2 KB Created: 2021-08-01 16:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d48b80820b1513d4ccadbd3fc07ebc2c SHA-1: 6f90c58f647ec80af660696812e6c6bf278f0290 SHA-256: ad924450bc922f5caf4fe474b7ba3dafab0654ec08f30fa7627fbc030695925b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

Heuristics 6

  • 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 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://archimax.ch/dynamic-images/cms/file/1925250870.pdf In PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ad810b81f94---dilamufofoni.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a9f126b52---vilegigemikofovu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/8864fed5b9633e85cd2885b62b923f67/92062699252.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210602174711.pdfIn PDF document text
    • http://premium-h.info/files/files/seponagogunonaguduvaw.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/n738q8nflgc6p6m1k1eo166k48/finatalofipolevowokobix.pdfIn PDF document text
    • https://appfacile.it/file/pakitoriwabevuni.pdfIn PDF document text
    • http://fvhs1970.com/clients/876770/File/20426929207.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106283a64c74---43095105877.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4c23bf0f8d0ef5a67f6870d149377fcd/9064415829.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb89907fcb---jemazigizuwed.pdfIn PDF document text
    • https://eternalbliss.net/file/subepabokulibulo.pdfIn PDF document text
    • http://yongqingtech.com/d/files/99497155918.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160979e88c119d---dutelimewobubukokavufadeb.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/91213644569.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc988ff39c326518ab6f1174cee29305/54369922864.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0aa3df29---sikofedawilezelexodin.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/korisimumasijuriz.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d1585b92---23175832659.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/fulodotalasubiti.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e5a4ef4f---detuxupotudes.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/26673498331.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/f65fa82eedcb3ad31cf5d9a057ae591c/6737517966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=chilling+adventures+of+sabrina+cancelled+petitionPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 11236 bytes
SHA-256: 5222e3cf9ca296e055250fe4c7eaabc905f1f0f520bc9883831be86e4ce31ec4
font_02_sfnt_off00012a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6C 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_03_sfnt_off000133a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A7 20492 bytes
SHA-256: bca94e58a671ab42424859fbca8309810388ce33dcc70ddbaebb3c0b2b168a8c
font_04_sfnt_off000167a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A1 16292 bytes
SHA-256: cd50eb7aab2f0e9a52beae6abbcea2f1f43057679cc4dd188eaef8d3d32b48e5

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