Malicious PDF — malware analysis report

Static analysis result for SHA-256 80139c9e92e97a92…

MALICIOUS

PDF

81.6 KB Created: 2021-10-08 19:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6aa66540e93ba0c58159bb1055660c41 SHA-1: c98965580f82b1435e35c0cdb5e0fb630f2e02d8 SHA-256: 80139c9e92e97a92ddd33a932b8b6dee1603b53b8a0186545b1da96a4ce10200
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a link farm pointing to other PDFs hosted on compromised websites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gonganmi.com/userfiles/file/lawonidujajuda.pdf In PDF document text
    • http://sergeybazarov.ru/file/51032357059.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/58a9c9ed47b65350799218f57ba50fe2/38211805921.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/32869709370.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f2d4e5b6b---susilawifogarov.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/bodudewetikukukugutilaluv.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/79568155845.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/72073120824.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210904160101.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mpeglvp30os18ljbg1tgjm4rl7/44316302246.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/dozanaken.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/rejipador.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/85314853849.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/redade.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/mavamogoxotebirufejigovi.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/44744538811.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/13975940639.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/wigenozubamitelomure.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/wenoduxukep.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/25976600749.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16158cc9f72015---zufemaxedudimigedo.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158a961887bc---74268161706.pdfIn PDF document text
    • http://szcftz.com/upload/nobofi.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/86648920080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=spanish+language+quiz+questions+and+answersPDF 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_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 11140 bytes
SHA-256: 4111ce5645d4e514d5c0d212f704b2ce5fdccaca72b2142878cce88b8c2c4f44
font_01_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 17840 bytes
SHA-256: 825c1fa8b45436cb2e1fa6d5bde0837e3241d45c7a74506351dcaa897372258c

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