Malicious PDF — malware analysis report

Static analysis result for SHA-256 c116fb722389aadd…

MALICIOUS

PDF

77.2 KB Created: 2021-10-03 03:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a5ee8a836f972564776c6e657747be6b SHA-1: cf881b08660064e0df4aa4ed7a4ea89e7683e015 SHA-256: c116fb722389aadd11b5b6f06d4782b5f4e552300c122f492286ad10d5246ae4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/uplcv?utm_term=when+two+capacitors+of+capacitance+c1+and+c2+are+connected+in+series+the+net+capacitance+is PDF link annotation
    • https://jagominum.com/contents/files/fidirikozuwedakebo.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/gilexadiloboniguguni.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/65283068849.pdfIn PDF document text
    • http://gptools.net/userfiles/file/94573847630.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/sj4l6clu7t3kqpnak5ho62o4sq/40346103464.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/52897965666.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109140445205984.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/23631977744.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ka0hg50bt5hqibhi687okmnloimkds88/96473083529.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161558c8d22913---pobisupetixoz.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161418f82aede6---21759766188.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bed7820d29---nemurulakemovudupulo.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/zajexokuzisofisen.pdfIn PDF document text
    • https://stopserv.ru/files/file/gonepilikebenokiviwinop.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/xarepabovofep.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210909_191537.pdfIn PDF document text
    • http://pay2pay.net/upload/file/nenuv.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e779ac1b8d---88629750293.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/mezosan.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/20231216469.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_off0000bc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC83 10920 bytes
SHA-256: 5feac446d3a1c69a95cf3ea095ff37a65c2f53c64ed988d8a20d6408feb03b93
font_01_sfnt_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 20884 bytes
SHA-256: 03fa63de54fa67acf0a0d31490821cd3d0bb1bd5165316fc18ab41d749862143