Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5d2404dd47f54b…

MALICIOUS

PDF

83.4 KB Created: 2021-08-20 18:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e36c5787c1619b4690bd6e1e3cac216f SHA-1: c3511053e86881784fc446823a4edb7cf4beed77 SHA-256: ed5d2404dd47f54b384c175aadeadcdfacbd3c4b412457d8365362bf43e8d718
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, indicates a link farm designed to obscure the ultimate destination. The primary attack pattern involves redirecting users through these links, likely to a phishing page or a site hosting further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://privatecambodiatour.com/userfiles/file/85760684614.pdf
    • http://zrdb-drogbud.pl/Upload/file/18123044683.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/25fd58a35e2c37c811a9c5849a7289c8/sodepirixasaga.pdf
    • http://sb-78.ru/files/file/bepig.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8je1vnajtq6pcg5hto3ot5265s/vonedenidofuxefoxoxeder.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c0d47627ebbe4fa68c879ba23517c425/guwobukeveporagel.pdf
    • http://szjwwj.com/userfiles/file///renesiku.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb269c10e---44405960821.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e3293e71d---vumovajazasuvof.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/45611961362.pdf
    • http://www.toptehnik.si/images/supepipuzusijupaminu.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b6acecda---58130030758.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b221a4091b353d79d7f42268311b4b78/44738535957.pdf
    • http://barbusci.it/maisUserFile/file/68409977031.pdf
    • http://merwepizza.com/upload/file/19450610087.pdf
    • http://hphs1958reunion.com/clients/47465/File/sezupidunexegelegafudolo.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0456cc29c---jefuvur.pdf
    • https://raiporjai.com/piceditor/file/lugepazakisak.pdf
    • https://hargagila.com/uploads/image/files/sibavujawitobuvekude.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160986f68660cf---vebuwukoxodaz.pdf
    • http://amexeuro.com/an3_Uploads/file/32927311329.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3560bf5bd---44188542929.pdf
    • http://kisito.com/userfiles/file/89976049755.pdf
    • https://ivanamihic.com//files/nekigokazunarigelubipeso.pdf
    • http://keralatravelpath.com/uploads/file/98129506515.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a533f2b51a6046a7c0672b2487dfcd2/bikemap.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b237f5fe6a---mikuli.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ejercicios+de+multiplicacion+de+fracciones+pdf
    • 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_off0000de39.bin
de2b48416fac0133ff2f3986703176e2b1a1854b49f276e3105f4bdef04f3579
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 10992 bytes
font_01_sfnt_off0000f7b2.bin
646072c7031402dae765c7ed109b7711bdc2ce5ab1120fe4029faab0d6d17470
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 18076 bytes
font_02_sfnt_off000124f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124F5 16792 bytes