Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdec653004aaf59…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 15:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9db6bb9d93238afd00795dfa55b4f4d4 SHA-1: f0d716584b956b633cf5ef2c9975c5045b80f4e5 SHA-256: 7bdec653004aaf59b3705e69bb3d27447eb0ba8e7a1de4f582bd1e032b17685a
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 phishing or trojan threat. It functions as a link farm, containing numerous URLs that redirect to potentially compromised websites or disposable hosting. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the extensive use of external links suggests a phishing or redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=length+contraction+problems+and+solutions+pdf PDF link annotation
    • http://murito.fr/ckfinder/userfiles/files/32083157814.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607341d1b2a78---lopenujefirifupomevajad.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160999f352be40---tegowokopanosoturoze.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/93749608335.pdfIn PDF document text
    • http://15881588.com/ckupload/files/denoj.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/27925797340.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ritewokegarasulonepanu.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/zozuposuvabirijowibunove.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/munikug.pdfIn PDF document text
    • http://rafaelokazakov.com/file/11004726191.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/86062423497.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/79001124789.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/68585952015.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b7685248---benodizasap.pdfIn PDF document text
    • https://agatanorek.com/files/file/viwebudopazabenov.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-13/20210813114323624752.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e2a456fb4edb2235f5ec20294a545c01/45338707483.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/lifebexesefosona.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/62251143003.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/59830204328.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/bopane.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/pawulexavorifuvetamager.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_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 11264 bytes
SHA-256: 1c7538d4cae1c6f9498ff982ae9f1e8c9853d90bbef565ee045e6eaeddb4b2d3
font_01_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 18540 bytes
SHA-256: b48b19db16b34a7846673e85327a135b475537c7c4aead44a737e73786a71976