Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d77d05f71c8b12…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 22:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91e5737f0c6abf669ba8af437322b48c SHA-1: dff2f2ec70fc3ac150f9526f49a0444163901084 SHA-256: 46d77d05f71c8b12fdab847eebb6c6efca075fab0ecac36ef419c263f1ac0d13
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm hosted on multiple domains, including compromised CMS upload directories, designed to redirect users to further PDF files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://worldcar.jp/userfiles/files/zovikifelafibekitifivujen.pdf In PDF document text
    • http://redemaisfarma.com/userfiles/file/fimet.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/77741376948.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1etu06ogai5n3cc3ivaukkd8nb/dupikereb.pdfIn PDF document text
    • http://st03.it/userfiles/files/kidafe.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/banumirogo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142a9a19b9b4---46213551756.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/52462166496.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/kufixebubuzasilapujoweg.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/38786434914.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/sazagepuje.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161406cc98c9a7---88633609336.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/71316241886.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/letobobetolatur.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/681530433.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/941590915.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161327fccb5ce3---kaligezidazobewig.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/57728966957.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/40503634672.pdfIn PDF document text
    • http://linza-market.ru/upload/files/xelibofe.pdfIn PDF document text
    • http://w-mill.jp/images/file/sudow.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/78998489287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dff+cars+for+gta+sa+androidPDF 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_off0000b9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EE 17324 bytes
SHA-256: 3b9371b6402dd7941e9d4ed033d998ce2293c7a2e0c4984c4c9a3f8b4c54f1ac
font_01_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 10476 bytes
SHA-256: 7bd5a268d9931225f85e447ca26cc98d97e7f6741d19aa957a2b59003b9803c8

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