Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c00432d765a732…

MALICIOUS

PDF

151.2 KB Created: 2021-05-24 13:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1070c9335aac455bdb2d8b6b1f3cbfc4 SHA-1: 521d3a0b8f3fc5abf0598d22c61577e5c3081d51 SHA-256: a2c00432d765a73283b56161b67431d518bce9a4b13cc7b35c8095d687ff0aff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm for distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8552

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/84910e7cec07c940d822e9e453d3129d/62703270694.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/8p3merkspmo54maokm9mtm1hd4/92068809575.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38a14574b---bamezupexawa.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725c4027271---debikiv.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e451b064b91fa21a94df0ab7bb96a070/34242083298.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8fd0c216eee87fe4eacaafb109b43ac2/39134174684.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608877e0c606e.pdfIn PDF document text
    • http://allasclub.com/campannas/file/225839999.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608351b738cd7---79323822612.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/268ef2faa07c00563d4875ea7444c8e4/49891799857.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c947559ff6---61402629458.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6abf8752f---19852810193.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/gikebizofokala.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e09efb8dacd697204a57a3a19026fdc2/pomegun.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608807b335b6f---nazob.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jklohc5ubg563g1qd8jcsp7141/ferub.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ebec92c89acce54750fda151ca7e753c/razodif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=finding+nemo+hindi+dubbed+movie+download+filmyzillaPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21499 8068 bytes
SHA-256: f1c9c11e6999599435ff80f6eee996040065b2f698b0216f01bd8bb894f39172
font_01_sfnt_off00023010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23010 5448 bytes
SHA-256: 6e51da6ea2d23c120111322da02ea2603e898c8d1efe1ed16eeed529ba9b3903
font_02_sfnt_off00024292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24292 5972 bytes
SHA-256: 580263dd86811d2067084bc2358828f8586d9bd504dabbc472c7b1af1869c015

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