Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ac5f447561bf2b…

MALICIOUS

PDF

80.4 KB Created: 2021-08-26 10:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a165d7476c56d0e36bf5cf24f9be1da7 SHA-1: c2162664ad536931620d474f2a0c3f86c0534f35 SHA-256: 16ac5f447561bf2b327a4defbd343d75090b990556b37b9d75c0ae1f879efe07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users through deceptive web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9509

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd622988f---14251897858.pdf In PDF document text
    • http://unsersohn.ch/images/file/noretibaketi.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/24717901005.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/27498049434.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0831ecebb6e7b9760247a459e5ccc88e/denoronifexunawimowinuxal.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wogusenasubuwazevipiwow.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/kujemikikiv.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/1c576u2opgj30m2o39ekms4q33/28588038192.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0310aed7a---71559288897.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/63409827232.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161126c2d01371---jigipakukeneto.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/fineveze.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/togopizadijibotigiwuk.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/rf88gclkdplagt09rpe7vkpgp0/15892623406.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3eaeb40ff---sogad.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/baripazatu.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202108142135594119.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/15703027591.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/64835181985.pdfIn PDF document text
    • http://jaika.in/images/documents/files/28201678748.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/1176006866.pdfIn PDF document text
    • http://yilip.net/userData/board/file/42249199988.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/86601038595.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/magogakumereb.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/zikibedefesaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=marry+me+now+ep+29PDF link annotation
    • 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_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 17716 bytes
SHA-256: b9e75bcf62f57af796b63e9e8f79180af4fedcbd4e6cc0ef1ff38399ad7091a8
font_01_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 10492 bytes
SHA-256: 96eb34be073f14ea8add0e7efd06fb8373edb835f4f223732bb345d67ffedb11