Malicious PDF — malware analysis report

Static analysis result for SHA-256 5558ad20102bca24…

MALICIOUS

PDF

108.7 KB Created: 2021-08-24 20:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e9a1e25ab1e3465a644e1b977e05fde3 SHA-1: 8cb4ef4d8ff1aade316cf6f393f89c820ba5c81d SHA-256: 5558ad20102bca24c4a4e54fe6dcba3610a80296047ce1db363020067e2cd206
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coretry.ru/uplcv?utm_term=florida+red+bellied+turtle PDF link annotation
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gn98jjlcpssehh7tkh4ru0df05/48261489041.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/08rc5pgsvnc3kg9ni4g6bsr7r4/fenejulajozep.pdfIn PDF document text
    • http://iltorg.ru/upload/file/51551159372.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161184460d127c---25409085963.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c052c9c6---81597041239.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e7e7f425---63350990446.pdfIn PDF document text
    • http://ruihuitax.com/files/file/tulivivaxomikejirev.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/10220743947.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/tijiwitewipi.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070550f3e370---26639958174.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/36aca8bc1a9e1fcc203dc9935b78d805/suvabusapabariwamejonos.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/30172965169.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da5ab7f386e---58012036076.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2ca47b982---pezelowiw.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/76341940183.pdfIn PDF document text
    • http://lagrupacio.cat/file/wixazozizoviroximuled.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0767956ba---44947438009.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/17647716508.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/7tktroknjfgg98u9sutnc8ed7q/8765495731.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/65572340205.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160983387d0b7c---wubekiwuzopulerajado.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7315d5f6---notopakugilutekasefe.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c49fa3881---60009467309.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14748 17968 bytes
SHA-256: 83902e82ccd11b01f979255f7a1b017e3059ad6264217247aa48e8e280b0a249
font_01_sfnt_off000175f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E0E 10184 bytes
SHA-256: 4767c7f142d13a10f6234544c26eeeec07ee543da42f067d9236bca2ad364bb5

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