Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd60fbbecf8be00b…

MALICIOUS

PDF

87.8 KB Created: 2021-07-31 13:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 222ee8379d6bbe150a20451e8d667019 SHA-1: 8f714abe7dfaa755a2d918b12bbe341614e85e25 SHA-256: cd60fbbecf8be00b32b7f46c0525edce5044f1f17e06766ff49cdd8697599be7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a PDF link farm. The embedded JavaScript and numerous URLs pointing to compromised CMS uploads and disposable hosting suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery. The primary IOCs are the URLs associated with the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96b2b591565d4328759227b66dead423/gariwetulexirikapuwakola.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f097ccf3f1---mezogasegunod.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kisewufopo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e9439784e77---savakar.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/8789540444.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8ik37fr9ruvsiv6emh44gm1v86/21469121426.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/domidixusedomajazo.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/11496499407.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/26637756698.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3866d2751eb76041ca3dd4b5932a0589/nukekujiva.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16082d21050c7d---43994910424.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/22ce4d53bc6979e3e9372e67a426b3f6/dadowedumi.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/sosofufazarufuf.pdfIn PDF document text
    • https://zzwgjx.com/d/files/fadofele.pdfIn PDF document text
    • https://aaaxxion.info/images/file/62190574450.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/885e529e30c4b85ede2329783cbc1d58/50291020029.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a396ea1ea74---bedifon.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9f419855---5880502329.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/80182247458.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8p4ikc2ska2dvaulr9vvkhftaa/wibidowonerawaku.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092f35187e57---fapavepanizusaregetini.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/6mag18314i1hfr49rkac1k4jff/xiberutonafe.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///51629551303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+root+android+using+kingo+rootPDF 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_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 10512 bytes
SHA-256: 122a3248092584f4c5aa89b76bfd10146644465f11d80921b82d5ef09a8d13db
font_01_sfnt_off00010d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 16964 bytes
SHA-256: bce81a6aa0e7d13023ea304732fb0d49aeecb988337ec9dacbf02caf8da00bb6
font_02_sfnt_off000138ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.