Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f64de342cd265ef…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 21:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7edf7c11ce50a03d7e329449e572906 SHA-1: 50afbbe7229c000aaec232eb9470022b49d0c01e SHA-256: 0f64de342cd265ef87d12a2bbf2698de3f775ab740384e374098c575f0c8745b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a lure, likely intended to trick users into clicking these links, which could lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://nomylo.ru/uplcv?utm_term=leo+and+pisces PDF link annotation
    • http://aelma.com/sites/default/userfiles/file/15570232049.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/pm7039lmqnga5lrrkb89th0dj7/kipufobor.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/993044223.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/49891944427.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/bukezades.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/bisiduxu.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/7f8f5f44274d3af8cede72f825eca79c/fanefi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607784a847665---xavutitenuxajuwepijomalex.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e414c117---potede.pdfIn PDF document text
    • https://trexanh.net/upload/files/xixokigopobas.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/27747377560.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccba4dcb57---35295387190.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612046a7b6dfb---27127586512.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/30750924508.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ee619f9176e---tukofadotasaxana.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/24537524318.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/lerakagapopudirulezofovi.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/gexekejevikar.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/pogazedebajakesufuvege.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-1/20210501081028592542.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3259ef3ccf---42862287544.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/niwizuxekuxiga.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_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 17692 bytes
SHA-256: 27812d79d6232b4412e41609d31bb0a4f55feeef3f4119377405d401c62421ba
font_01_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001366d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366D 10220 bytes
SHA-256: e7b0249214c411644e2d29a3f1b70add93fee157a9ffbe304e3be8a89fc8ffb3

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