Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed470faaa647365…

MALICIOUS

PDF

81.3 KB Created: 2021-10-07 20:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5c9d838f51e73cd9feb54aaea100ea80 SHA-1: ba3762b6df61e4ff30893f3ef023c2dcb77597e2 SHA-256: 1ed470faaa64736509896c21d01116a533e3953161b90efac0c8c44bdfd17bae
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to link farms on disposable or potentially compromised hosting. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of hosting malicious content on compromised websites. The embedded JavaScript likely facilitates the redirection or further exploitation, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://northmarking.com/userfiles/files/68445598858.pdf In PDF document text
    • http://klubalfa.org/img/userfiles/file/gakosotimomanelukapide.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/wujenavoj.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/73028928553.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/guwogifuge.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/827aced6135bdb733161d98d92613354/pijaw.pdfIn PDF document text
    • http://indel.sk/userfiles/file/xibazexurofovi.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/veseji.pdfIn PDF document text
    • http://teraval.cz/res/file/midedotoxadosiduzujemofe.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/kezozupak.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/divebevokezowuwolo.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/woxevawuwolesaronusem.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/xezelegizasibo.pdfIn PDF document text
    • http://orem.mn/uploads/files/fefiwoluzupibibitiped.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/83131795008.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/51964752685.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e5651796c057ddc7752d220e2e5f9c81/reneralav.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/16219847386.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161544fe06abf9---17049069255.pdfIn PDF document text
    • http://xn-----6kcftbqgtghjv5bf5gydg7b.xn--p1ai/files/files/bafipufotegeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=security+algorithm+in+cryptographyPDF 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_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 17216 bytes
SHA-256: 5409727e135b240d37fe55777d3073da9d9987dcb96ff87c1a1b708ad227e362
font_02_sfnt_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 10944 bytes
SHA-256: 634863ad0140619ea0d83c334dd184cab6ce01a3b8eb890c6258ff1f179c739a

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