Malicious PDF — malware analysis report

Static analysis result for SHA-256 098b065b06820f8d…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 16:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73f2e3df6beb1c88545b532a1eb808e3 SHA-1: 18e06b5578a0d848d0f47bafd1ef39952d71ac39 SHA-256: 098b065b06820f8d992051773d0b9e295e177d76688c7197d31c31f422b3fb90
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=camera+360+pro+apk+latest+version PDF link annotation
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16143c32d4fed7---fabarebomibivaboduva.pdfIn PDF document text
    • http://yibetter.com/data/files/62600615843.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cuiqt4i7t4tt9nstef5ovdpm17/26317308372.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/kurikovozekefodikitiferi.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/40305762796.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/34794588610.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/45891356302.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/binubejufizirusu.pdfIn PDF document text
    • http://hbaoge.com/upload/files/vojinagibiserejanib.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/mutet.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebd143b9e5---nefulonejo.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/91651968489.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/30805321338.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/11240325555.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/xetag.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/39044367020.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161417a172ac35---sarafupujezopazojuwoti.pdfIn PDF document text
    • https://linardi.ru/files/file/27937293194.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/salawiwar.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5rcqqa8un4tri7q5664n9q49or/83970789596.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/zexabawaxasejaxajexijavi.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/xipawegejali.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/30109285409.pdfIn PDF document text
    • 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_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 18072 bytes
SHA-256: b386a5f1103f0e1a8235b96a676777db3a9ee277a25fdd02f4d5f0b4eb3a97d0
font_02_sfnt_off000133ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EF 11064 bytes
SHA-256: e3429f22077ee82feadc46cbcf0d615d1df079bc665b4495ee0a8314a138e707

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