Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b77ea7796e75200…

MALICIOUS

PDF

86.1 KB Created: 2021-09-09 10:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e2c1433a62cb6cc243235928783ddfa SHA-1: 6a3007dcc0d963399894c9f928402e0aeb76d783 SHA-256: 7b77ea7796e752004f519a71be2f31cf05644a77a9de25ae330c1d9678425883
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external websites, many of which are hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links on potentially untrusted hosting suggests an attempt to obscure the ultimate destination or to leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=best+free+sites+to+watch+sports PDF link annotation
    • http://land89.com/ckupload/files/15261121459.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/45377176407.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/livemukojavavagivap.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/zurud.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbff29c8c---dimawinorulesezube.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/41678235334.pdfIn PDF document text
    • http://vladekoservis.ru/files/88889215595.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613381b76dfe4---65568882140.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/1011348379.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/xekulumoxuloxeto.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/10010812693.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/wozuvopajijazazugobowa.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/52093244655.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/zoponuzadefulasufib.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/82236642806.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/duwabudarivegab.pdfIn PDF document text
    • https://miet.hu/kepek/88843708473.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/83916804187.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/43241459798.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/luwivekazeleda.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/md23hjvstmg4uk26lg23bb1kl9/71690880373.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/92691193597.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/kinaxuvu.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/kirinapu.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_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 10564 bytes
SHA-256: cc723835cc44aca7d7c63b9cd95934c3dc8c0fe0971ee44183d3ea16628b24bf
font_02_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 19056 bytes
SHA-256: 516a05f22f30611528bef104cf597dd88762b98db8acdd5f75bc01ecf0728d81

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