Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0e3912d9ce3f69…

MALICIOUS

PDF

91.8 KB Created: 2021-07-10 07:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 129a3fc0034fc7c005412096ed1086be SHA-1: 9d826d1ed5a601e4306f402dd86139e8f7e6c144 SHA-256: 8c0e3912d9ce3f692a4b7832c261958072222dd57382c8c806b05b92a7b92676
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves tricking users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b7408efa6be99555b555127a90294f5a/93591260240.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e67e2bac9519a84d1717ad52ac1bdf08/5586524620.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3f620b6ab---5844878749.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/galonopejefadesoxomitanag.pdf
    • https://aquafilling.com/userfiles/file/mitufigigepuribozejufu.pdf
    • http://jp-cable.com/d/files/tubozazovikajebumibu.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81b5b1361---7248755077.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/l2q6mooudfkn4ged1n2866si53/59162581160.pdf
    • http://automotiveenergy.cz/userfiles/file/96628589734.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14df5b2536---xaxalevofukowitigi.pdf
    • http://ruihuitax.com/files/file/34310580132.pdf
    • http://ahlhy.com/uploads/file/082005552537.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/77183223712.pdf
    • https://fultoys.com/userfiles/fosipewug.pdf
    • http://shuswapladystriders.ca/userfiles/file/pemukeza.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e56f6865f---bunikagijikugo.pdf
    • http://iccarrentals.com/files/file/93079039348.pdf
    • https://autosaloncenter.com/uploads/file/tusudumunavumaluxorafe.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/dvbeasoqg3b8lu85pruan4n5g6/fupusevikubuwuji.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/790284eb5e388eee007fd4e7212e6c66/92993501571.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff39b93cd5---72486869583.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/03d4acbe09b07ce08ebb6be96f7ea0e7/gewefamukaj.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b18a47040c5---bixoz.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/fa2cf116057d71c4e4b8e571ce6055c3/26506514023.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=doppler+ultrasonography+of+the+lower+extremity+arteries
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010401.bin
d4949e9f0eaa312d285780d0fdc9a9f44de73a4e09a0851bc67c50e6f22ff23f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 16624 bytes
font_01_sfnt_off00012f53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 16792 bytes
font_02_sfnt_off0001476a.bin
387594f4be9769e9ce15af6fd1f995e1750804b04ba1482e679558c6c0dd2a4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1476A 11208 bytes