Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0a65373c72a0e1…

MALICIOUS

PDF

92.7 KB Created: 2021-06-29 21:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: edca5cfed6b23279d54ab43453531a9d SHA-1: d2cb0eb2c7f5c220a73238d85c467bf45fcf8eb8 SHA-256: fb0a65373c72a0e13cd34486ab2505fb9ba3a6f604e75cd36c17afb0dab9ff07
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which are compromised WordPress upload directories. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://zhengfutz.com/v15/Upload/file/202161882607009.pdf In PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/7535129ea9d19bcf7ab92b3c19b84040/mipexojomubigasukifi.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5db31c89d5aa1afb1d0dfdd6c26b37a9/79381611789.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a024f2a88---62561795119.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba82bd8d381---xedivaduwalogotunaji.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/88d02nngoeflf9t9hd76uc3qu7/92674363902.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8cbdb47611f58f0e14ce2894a0008377/mitotadato.pdfIn PDF document text
    • http://proxima-design.cz/files/file/80668272430.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/8d01d974d45fffb69ae03f472cffb151/31722823115.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3172c925d---wewaguvumozerex.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/kowitibawasedokeluvitozeg.pdfIn PDF document text
    • http://teraval.cz/res/file/63801739521.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd69c99e9---11815283469.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c4bd19b1---21288231149.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/eaa494817542e077250a3e2a4602bc3d/xoruzofazexumukikojilijob.pdfIn PDF document text
    • http://www.toptehnik.si/images/biveruwexekuxotutelenur.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/36063213308.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d94589f5da.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ddcf26e20e27190015b22d3d5ec8c082/gazanujakivividiwivijir.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3862df02ce---gaposaxarakosovixeget.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/xabalukotabewafen.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160951aac7c61b---jewadeteroma.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/vuxisosopitijibujat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=linux+in+a+nutshell+6th+edition+pdfPDF link annotation
    • 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_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 29332 bytes
SHA-256: 195b351c13bfd0995796bad515d1f60fefaae8646be94340188fb69aedb543da
font_01_sfnt_off00013483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 10824 bytes
SHA-256: 1c174283dc3f1ce698093e15216fe6a3de1e28351d102d9911a1bf6c0f56ae99
font_02_sfnt_off00014d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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