Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30d2578305c231d…

MALICIOUS

PDF

84.5 KB Created: 2021-08-11 13:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d43fa36bce618c59c87640551de96786 SHA-1: dcb6104b50f7b5803b134161d26001cc135d8907 SHA-256: b30d2578305c231d0a52059afdea70acd986f1752d37b71cf98b1d4d430b97b6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The embedded URLs are designed to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8668

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://hebakotb.net/userfiles/file/povokeximupupisinemu.pdf In PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/favatonurulupenenuvoril.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/tifotapebetusaxipovimokuf.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8c15749f42335d952ae6883ff1a01308/57121503644.pdfIn PDF document text
    • https://olterus.org/contents//files/votof.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/momipolorerizupu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b40db710a0e---zunewo.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/061b4efc7ed7f35e2df1bc6bd9862025/87934832688.pdfIn PDF document text
    • https://lecachet.fr/docs/files/94746685043.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/73414608779.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103bd61ed4ec---78102840572.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/45580eb2fde54d65710e4c5c961fde81/sunoda.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/u3v2rkosd8pj0f7crokc143o0o/89502909091.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b472a584757---norunepifizuw.pdfIn PDF document text
    • https://moolans.com/uploads/files/62086223971.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/3d1698b7d70244c25835e38a9992a2aa/46366019615.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5293ed49a---44154554767.pdfIn PDF document text
    • http://join-angel.com/ckfinder/userfiles/files/kogutuxiduzibezujomuxigu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8c3d48afb2e38dda7faf4ece393c5e89/10923567224.pdfIn PDF document text
    • http://labotinnghia.com/img/files/63678839909.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/da78e904ea2eae215fa73fbcfc6a1c7a/954923973.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb6808c2da---51922272108.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eff81565f---kogivipanebedapulesad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+pair+indy+headphones+to+each+otherPDF 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_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 10856 bytes
SHA-256: 8cd57355221d3b1e6203fe68646829201ce48f242454f8aec4c3836ade85008d
font_01_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 17812 bytes
SHA-256: f6ea06f56e203bba1960c9270039175a126ae258323765d287399ab899639c9b
font_02_sfnt_off000136d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1