Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e9945d6b1347cb…

MALICIOUS

PDF

68.9 KB Created: 2021-09-30 16:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7c28543180e32e707977791398269d52 SHA-1: 139489f0f8b8354c9a75d343b67e70b396886708 SHA-256: 92e9945d6b1347cbc59d1a1b3411e49248916d0b1a5a018b993ac671b3bb16eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://nomylo.ru/uplcv?utm_term=download+osu+droid+beatmap PDF link annotation
    • http://windowsplusllc.com/ckfinder/userfiles/files/tawikovokexaviwoj.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/8467239583.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613979845295a---84656599947.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090305065962.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161543e9e30e95---suxugixofubud.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/divejavimosano.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/kuwugajopinatatitone.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/7652322304.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/suvumiwadipenevotobepafam.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109141858268279.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/lnkkk07b5vreti3lnmnop2u7vp/bekimugutinopige.pdfIn PDF document text
    • https://chp-travel.ir/data/file/rofuzedatobasuzax.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/29070385449.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/86879182737.pdfIn PDF document text
    • https://ebmcordelles.progess.com/userfiles/file/30220431178.pdfIn PDF document text
    • http://htwy.com/upload/file/dajopesefakixak.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109220229373954.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/nepipafuwexir.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/tidif.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9e72796d---pewizijoze.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/zawalo.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/buzaxakudez.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/17721796971.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_off0000adf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC602 15356 bytes
SHA-256: 11eae6864cbf8e9e900575255b90723d6b078fee949239ea1fbd09780e119925
font_02_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 10880 bytes
SHA-256: 7e430df4fdd2cb2371a2ee16e268f4b1f90eca3a094437f209c9c06db1c2e054