Malicious PDF — malware analysis report

Static analysis result for SHA-256 6911cd7cfe9a2b9c…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 16:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e217d781428283523c4bdd5e96603404 SHA-1: 4d88cfbbe7b339d7a5d8c629f2b67ae04364f335 SHA-256: 6911cd7cfe9a2b9cebb6821b48f8b15928f9f4498260b60b28681e18e88f11fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crewmak.ru/uplcv?utm_term=liftmaster+8355+owner%27s+manual PDF link annotation
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8e5hdhuj7crr4a2e0th1hc7r0t/31707109528.pdfIn PDF document text
    • http://airmon.hu/images/files/suzebuduguxusewekekogu.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd5bdcf08---78767172444.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/84739077529.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/605b132c19c3c5721893e86f117fa3b6/41954471516.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210819162429.pdfIn PDF document text
    • http://didopack.com/files/684875969.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/ce19b7f3fe1019260f7a846fd18c769b/votetigunivevarupetigi.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210613191710846.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120002b9564f---69497700659.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/59841272702.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c0cad4e1---jisirefibilirotaxa.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/db7cd9792568d9757d439e1dc8d5a47f/pukixipidijudosufolak.pdfIn PDF document text
    • https://sanidom.pl/img/file/gawafizebonasugemul.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/65264297969.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/7457933807.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/forosabujumu.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/pifidobivi.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/86807372291.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56e546170---55589414289.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/boforunedugabirixaza.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85de3505de---16114254377.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/soguzepifi.pdfIn PDF document text
    • 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_off0000b6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 16752 bytes
SHA-256: e952b31868e65e1876875ffe760d6d6acf8115593851f5eb6f9676408e7114e4
font_02_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 11068 bytes
SHA-256: df3b479eafa85535fbfbaa2394f2bcc2e79b4b5fc73924834784835b340ee453

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