Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b952ccc3712536…

MALICIOUS

PDF

89.2 KB Created: 2021-06-26 07:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1682cccf5bf399da80ca48e359b64794 SHA-1: 6d8252073448ae1f7431cb56c5a8474829753853 SHA-256: 99b952ccc37125360f78e3fa0cb7877d7bf0b014a36ffd8fabfff9c3680bbbdc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These factors, combined with ClamAV detection as a phishing trojan, strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=living+as+missionary+disciples+pdf
    • http://grandrosso.com/js/upload/files/newefusefej.pdf
    • https://pergamine.com/ckfinder/userfiles/files/79988636329.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6463471ed1---lipapogujo.pdf
    • http://abacusnancy.com/userfiles/file/62333337547.pdf
    • https://supermagnum-bg.com/userfiles/file/30415305450.pdf
    • https://pestresolution.pt/site/upload/file/tixat.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/35939c173ccb003c36d3b3d66335118b/boforitolofutaruvi.pdf
    • http://119hero.kr/userData/board/file/22979106012.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/78441ac00e22b1931d1df94b5c903b5d/lobumenetelobinadaxesij.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b363740ee03---78548088792.pdf
    • http://dmhu.eu/uploads/uplib/file/79931666032.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b89479be---xuvuxozowekujitadibi.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf661d2ad---pesovoxudatedale.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1cebaebe8---jazemuxupulexelasaki.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5c5d674533ff7774b24a645de5afcfd4/39649460664.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/3393440702.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082f3f3c7900---puzodu.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c94b18f3523---69569828177.pdf
    • http://learnazia.com/fck/imagesfile/gonusijitupamobolot.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2e90eb537cb48f174f4e3b899909b400/53126114679.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b2c80110d186516e5642279bb65858ce/11137081478.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4a17377edffd4489cee7fd48d1805724/97568263934.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9e26b4f0---20391468145.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_off0000fad9.bin
4e0eb589c38fd86b275852c0e74d2d9f0bba0730aafdce9bd165305e54a83163
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 16844 bytes
font_01_sfnt_off00012640.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 16792 bytes
font_02_sfnt_off00013e57.bin
f0a132db0faf66cfc44f87ec22b163594b34a6a137742993c1cfb890ca4f3474
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E57 11000 bytes