Malicious PDF — malware analysis report

Static analysis result for SHA-256 891c8368cb981b48…

MALICIOUS

PDF

73.7 KB Created: 2021-09-08 01:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de13e3544544602d6cecb627860bbcab SHA-1: 1c10e8bd44d9ea4dd4ddae99f1bf5becd80f9c6a SHA-256: 891c8368cb981b480dcd358e3095428ce3655fc3162764f07843cb208cae6a63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it is used to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=best+workout+routine+for+building+muscle+pdf PDF link annotation
    • http://plkorea77.com/ckupload/files/buzilogijak.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/39171685158.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/ritigafeloluzekafumasu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161265bded2dd7---vojoxenowalanisodip.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xuzixedufapujazobexeda.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/69805427741.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/e29cqm4ofdgthi097k953or294/57280145567.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc376089e7---kokotira.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/945d5641dff84e247e6c1204c1825176/weledemozi.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/92737503320.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/3nilvtca2s1tu7pul9jiemka75/xagobabijizinasoledevulo.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210621_483084E97EDBD394.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/38258170790.pdfIn PDF document text
    • https://beaszemin.com/files/vanoma.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f52654088e1---14207938229.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/zalemeworedogurufikunuj.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a57767b1---vavasiz.pdfIn PDF document text
    • https://bor-diing.com/upload/files/55266192776.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/midatit.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114648a6956f---wozidowasugow.pdfIn PDF document text
    • https://digireg.es/upload/wiwopob.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070347a87277---50696557406.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7d6e3910---tipomotegosif.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/rorigowopelemakalu.pdfIn PDF document text
    • http://renknh.com/ckupload/files/dajaxupowatipowanez.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_off0000bcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAB 16408 bytes
SHA-256: cb73e1c09036d5fe9de8e53d5e32e947c760600d49b9be5b141215e1c5cc74d3
font_01_sfnt_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 11272 bytes
SHA-256: 700db2c4f1336c100319fb8664a67cc8367b4a9a8b1768cce830c3fb43aeadad

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