Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7bcf2930b317d4…

MALICIOUS

PDF

83.8 KB Created: 2021-07-07 01:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6b0898bd75a1f23310d464c55263e879 SHA-1: 3ab4fda3e24db33dc8c4fcbd04c033e80c3a8c42 SHA-256: 1b7bcf2930b317d415928c0163e108126fd0869e552b647859761abe000f7c12
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous websites, some hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or directing users to potentially malicious content. No scripts were extracted, and the document body was unreadable, but the overall structure and URL targets strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=business+to+society PDF link annotation
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/912f61cef93dc383fb3d8fdfcb1c0d92/90553275371.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/puravokuzeguzefufakugu.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/80116848837.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/8742657636.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/silabiguse.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/c6e7ac0aed62bb1bf5b6f014d30806d3/59486173769.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/507cc54d694ddee9711b7882bc065477/50045227139.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/70pp3qma8gmqke2f2jpid856p0/rakuwilerujipaduna.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021070517052573499.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/kufezubivisuju.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e095162cb40---70163917575.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/7501730896.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/91923053491.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/42855003530.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/vdsp6dfkkn03jmm43ne6tekkoi/66067139676.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607522ec146df---82674162466.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/lanolabotavop.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/66380ead9d27d700db9a2081f36ccbbd/wulofomasorumanoxu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf22ee93242---11948141581.pdfIn PDF document text
    • https://peterdegendt.be/file/supuwupuxowapaboxewat.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/54572434106.pdfIn PDF document text
    • https://senhewood.com/d/files/5572142231.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/56886756239.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_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 10184 bytes
SHA-256: e0f72d4a7e336928b9e83e815592b3faf0b932bfc1f3b2c403b058fc2b5586cd
font_01_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 16080 bytes
SHA-256: b4f3c5709ae1ba9c4fcd0e1690550aafcaf1a8d0ec30bf3c24865f4f04afbdce
font_02_sfnt_off000128e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1