Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb557d8353cd5c1f…

MALICIOUS

PDF

83.2 KB Created: 2021-08-07 00:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0958f2f2cd1292e4bc8da929cff2c1ed SHA-1: 58b21a01d83179e8deea8520f5e0de5cf821e805 SHA-256: fb557d8353cd5c1fe177ebd10efde5da5b8c1bf44a803fb7b4bb89d87a6b34e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malicious content or engage in phishing. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8422

Heuristics 5

  • 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
  • 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://argyleliquidations.com/userfiles/files/paxenoj.pdf In PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210608114822.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/in6ibjqric37r6lfk101eilibk/73576030128.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/96194629888.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3d10dec83---98947915580.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b78818d256f---4157916163.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/gapokosopiwosexuwoj.pdfIn PDF document text
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/gubatuxotemene.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f4dee224---53216966470.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/baruwopozo.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/15986193510.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/fukapaxa.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0e30a1b25f46aaec18cd5cb65dbcf9a1/23986119392.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/20690272964.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc1cb4383---dagotesoxupunibepizivabi.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/88052129081.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/7561848476.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/mamefepolokifubuko.pdfIn PDF document text
    • https://tadimtursu.com/image/files/26839740985.pdfIn PDF document text
    • https://primer-spb.ru/files/files/54377348167.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/41v8jg4tdpja3cc9sp3o33ejea/zumurepeporimez.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2729a6937e889218eff010a950524630/10910514163.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/67311794154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fundamental+of+computer+pdf+class+9PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 10936 bytes
SHA-256: 90bb33ebd7cac9ee8cc09aa8f09eecbb71222dbea2f996b3ed34781ab30c96f1
font_01_sfnt_off000110cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CD 17056 bytes
SHA-256: 195813881c33c019a5d082daab7d878709c61cf3da153fcd28e72edf6a6de92a

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