Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc7568361a9c7f2…

MALICIOUS

PDF

69.5 KB Created: 2021-09-20 06:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f69f160e79aeb47a967cdc36c87b9635 SHA-1: 5f806b3080991584a168a28f01b7b458c1332486 SHA-256: bfc7568361a9c7f23617340ce90d5f5d3e1aaead51ca8e1ffa80c30479b30ee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lure users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://qbcar.ru/ckfinder/userfiles/files/dikesukuguzujame.pdf In PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5rqtjtjrfrfq7bisr0jlkd6d89/4975500265.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/mufinekoteraraf.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vixibodulide.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/pikoxilitamufemu.pdfIn PDF document text
    • http://home-plast.ru/foto/files/45377337672.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/zomigefejiwalasoz.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/9929324817.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/32588782305.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/31071948598.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/givewutidoliwisajak.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/39664230050.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0e87ee89e0660a3c1bce34842686b596/zuwak.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/68204439502.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/38408182534.pdfIn PDF document text
    • http://master-vin.ru/files/file/bixaxilanewewatobub.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/gikaniku.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/94976100993.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c440ac565---jigovetokilubama.pdfIn PDF document text
    • http://petrduchek.com/files/zofizixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=american+english+file+pdf+free+downloadPDF 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_off0000af77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF77 15608 bytes
SHA-256: 2e80b049ba7cd29594d982453481e8aefd0e3ede7156b24f942bf21424af5e92
font_01_sfnt_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 11036 bytes
SHA-256: 7fb6e7066c57b850c8f760ac80a2f211f8b0886420d8f29ad605457b9736fa56