Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e3c99f5b2cc44a…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 10:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2369695699e270151589a7734123f99d SHA-1: e99e48901457d98b99347e6c69d5fc41dfcc645a SHA-256: a3e3c99f5b2cc44adcf6607d41a262a3ec4375f2dd1989d13f6fcf6c2b91e9b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://familiegravesen.dk/ckfinder/userfiles/files/60788505216.pdf In PDF document text
    • http://laweasy.kr/userfiles/file/34760198713.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/71999b8816eb6b2ec6a7cf06c92aa6f3/lusemazegige.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/xafolukedobodupuwatej.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d753ae90daffa1b8b64c0b0648a1cd8b/jiminagidufadoj.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607df1086e176---57959208208.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/27186131039.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/gqdq1u7su7tqc0t6magnquo0o7/40809383469.pdfIn PDF document text
    • http://rideco.hu/upload/file/4736960718.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/79733829531.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/1627f2be0594c772e7bc683b328b09b1/vawolumowukulixegazolupu.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/rikaxajivaxa.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/jazisilusejidufoso.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087ccc5c28e5---pusupuvetusileliw.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089ecb76ae8c---33990352493.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/42184942236.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/40376414789.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/xidunorinav.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608311bf8bc4d---67746670859.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/61743648505.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210708030449.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/38051926814.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/lc882ap4cbbmtutvvnd1u59qkj/40227212096.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/18129129169.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10b90941a---80075623220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=northwind+database+access+2007+tutorial+pdfPDF 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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 17648 bytes
SHA-256: a3bcc7fa8cb56a25bc52d46b448e5033b15e605782d1106a74a97020e1be092d
font_01_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 11312 bytes
SHA-256: 1ab9ddeb78c273a71d1a26456794bcc6bac2e4e8b5d9731f8aa382cfb1a54cd5
font_02_sfnt_off00012cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1