Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce2c5195fe34c98…

MALICIOUS

PDF

134.7 KB Created: 2021-07-12 22:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cc88acc40379eef189a60369e973070a SHA-1: 0b9d95ff1bab1645c824c6b243c571b9c85bf8f3 SHA-256: 5ce2c5195fe34c987b54b687f94af546a8a7faf8847510098bb55e4fba980e31
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9385

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 https://tuvanthietke13-5.com/webroot/img/files/46710758476.pdf In PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8d9cf30b20823b387cec81923d595ba4/mujereviza.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70d3f9e215---sesiju.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60e333430b---16178337285.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j4iur2fndvtiiavn671pckc7o7/naruwofelu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a458b893575---sefixo.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/7a53242ade6032f24fa5298e7026c0c2/84754757977.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/17798569386.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/26217340460.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/6069c805a3a8d9f68ef56fd19fd91c6a/19648777805.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/36brg5eccdvqvhmd1brjkga7lp/konam.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f5197ab249f438d7fc99a2da91117cba/21726970419.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/75743930351.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/65381022816.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/39797356384.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/wedolaxisugajipaliber.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jl9pdjv40jbenoic36c6bbd6o3/fazerobuvapevezelavapo.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/korezesovinebonaguraxegog.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8e866c882---vutitiwulopa.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/3808780756.pdfIn PDF document text
    • http://industrialdevices.in/uploads/ludakejosirebagijujire.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/towetirekirejetujawo.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/jelotawidunu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d2b428d0a---jukefakusixalasebasosiz.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/tupokeza.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/3a0d02b570d72f57feb8cb8d2860b20c/75091625739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=i+will+worship+the+lord+for+he+is+mightyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A262 18860 bytes
SHA-256: b01dd3632a974806d64778f06757bc29320696c97503918dbbb17ff022c44696
font_02_sfnt_off0001c1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1C6 10832 bytes
SHA-256: e438dffce0ab2a0a81fb3cdcd892f771bac13b6759b3da013b5a3871a2625ec6
font_03_sfnt_off0001da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA96 20188 bytes
SHA-256: bcbff39fc29aaf3715c0c56e3f3619234c63cbe6a3fcad6ed0d4460acbb5e7f8