Malicious PDF — malware analysis report

Static analysis result for SHA-256 80136288b3f1aefb…

MALICIOUS

PDF

85.1 KB Created: 2021-07-13 22:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e07a5e21362a21dd454b33f9fea4be7c SHA-1: b0a4026edd4698405c8708c8928021abefe9b643 SHA-256: 80136288b3f1aefbc6c002a60dd1f3e98460895342d845c4884c76c6e2bf19e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d302f7e484---zalaraluxerodurugojitit.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0915dea6145eaa5a9bee9e4df79e9228/kusimopikef.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/cnonsk4uo33vjct12faith8ov7/54828308839.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210628180353.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/da7niapvk3g1me4707kee5o5ud/xenesuzufip.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/ojoa8q99ufhomev6si21ia6sfq/41414676551.pdf
    • http://phuocthuan.vn/images/pic/file/61127322509.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070b21326871---bupoladuseserove.pdf
    • https://badoza.net/userfiles/file/litefudanawaja.pdf
    • http://acecaalcoy.com/userfiles/file/vevegati.pdf
    • https://oversaslogistica.it/file/54728497953.pdf
    • https://bloomeng.com/uploads/24944363885.pdf
    • http://tzoetemondje.be/uploads/files/97065612259.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8b082422---xesej.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/67469509832.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/cbb681ad459e1faba525271beeaac60d/4716335784.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074186358757---38566234114.pdf
    • https://liur-krd.ru/userfiles/file/vosederidonipadus.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5e4b4dea1e131c4e37d8be906a6e1431/60865114277.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ea3f2380b---503681254.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/2nfl07mgf81i8mqrjb57dnmbsc/bozolodixugu.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/353bea531959b86b472c35f2d69375d9/22981976933.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=chapter+3+the+rock+cycle+answer+key
    • 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_off0000e87e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 16792 bytes
font_01_sfnt_off00010090.bin
8c1ca176c429e041dea48cb50026517bd939d822e7ed017cc739bb4ea1a6829d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 17224 bytes
font_02_sfnt_off00012dc6.bin
79f6ca029e1872980ad6847631412440e6170059052c61c135eacdfa8e421510
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC6 10876 bytes