Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1ee6aa79b6cbc2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 14:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 744de80e8fe7ced5bbbba545d4d69946 SHA-1: 184935b9f37a84ff19937b87b7671bb52c51733e SHA-256: 8a1ee6aa79b6cbc2382f2dbc5556380d47bfe71d366ec05758bf2bba56acad92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://aodaibooking.com/FileData/ckfinder/files/20210902_5C74E0E9BB9E9D92.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161187373bdbdb---88670351438.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098b07488264---78605169924.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/78511040418.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/15520518069.pdfIn PDF document text
    • http://retailcop.ca/files/75829747465.pdfIn PDF document text
    • http://lucann.com/Upload/file/13255013059.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd60735da4e---wuvikig.pdfIn PDF document text
    • http://tcihk.com/userfiles/lebudejedalov.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/narujinozabetedeladu.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/5167d460476a98429f03ba3a49487171/29335762333.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/dukufegonuzitesi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d3c29f6c325e2b9214f8c852ebafd3e1/44052801208.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/kozegutekimabo.pdfIn PDF document text
    • http://amandamaitland.com/images/file/gebewememofewipubipeniwu.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/dorilufovetipedatumi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/pifupinabuzezovudagaxuvuz.pdfIn PDF document text
    • http://dmkert.hu/files/file/51519212150.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/fumuf.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/57448197182.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/0jqpg46ebcfvqecftsg1v2aik8/wuketujowiribavinijir.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/28001959512.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8d42dd08---868932057.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/nugaxubewus.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/58610578471.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/4686311641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=active+and+passive+components+notes+pdfPDF 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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 18340 bytes
SHA-256: a7a356e1107b390c50ccdb77abcb4bee8445881d099e7b3f11d6d8d36d62c7da
font_01_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 10684 bytes
SHA-256: 22f88b477bb8de779dd614144da97815424a7851ed390a201d90b9896e466456
font_02_sfnt_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1