Malicious PDF — malware analysis report

Static analysis result for SHA-256 102b7a4ea54cf800…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 02:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a01a45d57e74aa544983729cf8c78f3 SHA-1: dfc8b08804575b3fd420e28e7f5d209d3c4c1d1b SHA-256: 102b7a4ea54cf8003dc61cf2e0b7efdf146f2cd9b27106dcce5b200ac4e35933
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=watch+the+natural+1984+online+free PDF link annotation
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dixukukipi.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/xubabelevabixemojikimu.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/juranovujenata.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/krulqschs42c3mfda22jm6obd7/tojelivupibiniwis.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/46834568500.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/3345727059.pdfIn PDF document text
    • http://annabarons.lv/files/files/mejosit.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/28757343982.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/45223908544.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/bolajipenufakibelufe.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/48078731922.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/rutukawo.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210912_0F8825FEEBC92C84.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0glh9siu52fcljnjdj2qqbun1t/35449305266.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/xixej.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/53686866052.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/61998802462.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109190203091686.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/panofor.pdfIn PDF document text
    • https://ms2oke.com/contents/files/voxujiwejodatovubafasok.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161465ef2d19dd---82589312343.pdfIn PDF document text
    • http://pi-consulting.ch/download/futavolusawilexi.pdfIn PDF document text
    • http://jawarakreasi.com/file/16086322416.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090619454273499.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_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 17968 bytes
SHA-256: b9debaeb839c030998673cc77c2e118e0664b37194c1e0ac52a7cf244ebd10ff
font_02_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 10864 bytes
SHA-256: 5f60d85301d21a97409be516cc040f5877ba4605c42569ec562dd17443b649a0

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