Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b48e621f4ad4db…

MALICIOUS

PDF

88.9 KB Created: 2021-07-02 23:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 560a49e6903b70d4713f04fbf824690e SHA-1: 7924d38103d43a09c55b77805011ddef8bcbcff9 SHA-256: 25b48e621f4ad4dbf6dabeddaa46b7150b4a9433176f9c1a42a1fdd790388b90
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are used for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://inwebjor.ru/uplcv?utm_term=beowulf+main+characters
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4bd1c3c0b8db70925930af532f14636a/10069086351.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c85176a34d58a7d0ae59c3d6f2cc1c8/55799220482.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091800b3f9ba---lusaziki.pdf
    • http://amon-syotengai.com/userfiles/file/24964337823.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/6fomtgihchkg9f2554qq3p38cf/86056680460.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb72909d7f---seguwefilif.pdf
    • https://actorconseil.com/files/file/lebenijedivotul.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/53166842944.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pglnp3ijq7ett0bmft7sheeg6q/kekirapixoxudoluk.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eafd7670d---jolifofogeto.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/69137b31cc2f4976894f1adbb2689754/xejinaxu.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c91b81ed02f---19843587746.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7c1d515e38eccc78d8d46f995263b117/labonaverabepatotigawure.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16071387a51328---66563494683.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037a242eb8---79246163020.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d774d2532f42d77966f478f3e6158967/marematowukiso.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/0j5gun3fv2g8je0vb9basr6e24/50199650728.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8d0b0b237847c4449155973a1183a9b4/joguduteximol.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/6153de62f6621860c695afd3ac63e7e3/34876155470.pdf
    • https://marathonroller.com/userfiles/files/fanekizezuwetovitaj.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e09d8b992367e2f32426e4d16c5441aa/45774231274.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609873de68057---7886662560.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/24a0f404ad37123419ac26d5a2bd4ac4/79657216516.pdf
    • http://asustainable.com/global/file/pevaxizuvobefi.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_off0000f7c3.bin
20a35891d46db1c7b3316c8e8522e561f2a2f05a528d5eafbaa48982a69876a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 10840 bytes
font_01_sfnt_off000110af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 16792 bytes
font_02_sfnt_off000128c1.bin
8ba83f66f3ac5c04652c9c5b3a60089b087874ac6c678ac1481d599cc017658d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128C1 17704 bytes

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