Malicious PDF — malware analysis report

Static analysis result for SHA-256 550daa4bb55f3148…

MALICIOUS

PDF

82.0 KB Created: 2021-08-21 21:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 883773c340700e87fa97e9352648502f SHA-1: af247eba7215a34f143f293d109f7a0a1dff8f09 SHA-256: 550daa4bb55f31485115c812c48e278e913c5beb86efb996197fc81a016e5c1a
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting an attempt to distribute further malicious content. The presence of these links and the overall structure strongly indicate a malicious intent to lure users into downloading additional payloads.

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 http://www.sictombbi.fr/ckfinder/userfiles/files/nupuxuwovo.pdf In PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/regalu.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/wuriloxolegi.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8f8d499a98e90bc5815e6459d858d44f/19344285319.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cne7htmg4reqrp6tkem258tjm5/23255660233.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/91328094251.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/24757389387.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/jotanudagimipuvuva.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/22510012761.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0060f5587568e3a38f039c3f538acd04/modinovigowikepotukokom.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/98227313352.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607966b50fc91---niwakixosafekogupuni.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/83446998176.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dc72038fc---zegesa.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16106fe45e56c9---dixuravedupobeso.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a7a42ebff---96096724250.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/97839542825.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/22cd6c23b7e387225e737593ae6f9a69/jisem.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/jitupokebibiloruw.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1cdc221a1---sitoxiruvomumixelatub.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/24487850463.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/dilkosjgleb4o5glj9247evqg7/97445310356.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/zuvisenukepodusim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=use+of+words+that+appeal+to+the+five+sensesPDF 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_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 16576 bytes
SHA-256: faeb2e1308c69d5652a60bad89b6e671bf890b967f360241899ee5fbfc0657a1
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 10756 bytes
SHA-256: 4e67b6a779678f76d1ed6884c1e7dcff469153c94d480bb5ab038f167b49bb69
font_02_sfnt_off00012254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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