Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c18af9f20813c32…

MALICIOUS

PDF

84.1 KB Created: 2021-07-26 02:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bae20602b89a26b992294fe1eb4ab3bb SHA-1: 6dcd6b41b8307462e823121e1af7824444465de3 SHA-256: 5c18af9f20813c323cd9623745e254810d55cb54fca502f0ac29fefe868f5e59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external URIs and link farm patterns, indicating an attempt to redirect users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • 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://werbemittelag.ch/upload/file/tudalixato.pdf In PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840a5f9ff3e---54582520747.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70cb92c75---39057464153.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d7d351fa---zigalagodopigixaseve.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/96123548103.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217a8076fd---nugelazadiwopalusuxapate.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c66ca8dc2---kefarawexuw.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9464f72e70---pexav.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/kajoxopipejeruluz.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94dcda0813---xebiwesoxoguborawavoge.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/misemudoxixesulowed.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a83460fee604d0c78929540a341c0cf9/7405346645.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d64b596a5e---puluzufemekow.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/52807608937.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/42991343590.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/bazunopitoze.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/96888030155.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/21682334434.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/94709957549.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cea8f4de---914694551.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8998059ef38f72795b6da1a9d8c0cec/63987743813.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/kuriwaronodaluwor.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/37427806088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bid+proposal+template+google+docsPDF 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_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 16640 bytes
SHA-256: 8f37a0a4b2466769a7b616f0ddf7ed6e5f915dfb9a3fcbd372be1f3d9bf224dc
font_01_sfnt_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 10808 bytes
SHA-256: 51eddc370813d7992b48e183cebb735d74cdb5877e515db10004b3584594252d
font_02_sfnt_off00012aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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