Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc57049b8702aa9…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 17:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b64599fd371b83db4b02a539a75bbec6 SHA-1: 9d1afb07fba914846ebdfbf32d22f2b3df275800 SHA-256: ecc57049b8702aa94700c79d738f69584f4d31c1df72c6b55f45a5b175f597fa
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, such as http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1705698c5---xijofetexejijizagodu.pdf, are likely used to distribute further malicious content or phish users. The document body is unreadable, but the overall structure and URL analysis strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://agendaalzheimer.org/files/galeria/files/nuxobupabisiwolatiwo.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8fe626c24501c85bac2191a79cd7353e/94210755275.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/lazazajenebomupo.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109010333091317.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/b1p5618f9vdmpv45g4glvs9eal/gokobatudufonoberoduz.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af3414aea9---kafixalawa.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/813671484.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/231920591083.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1705698c5---xijofetexejijizagodu.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/nusoguzefujijivap.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e03ef41b3d9---nivame.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0cbad5bbffded44493ddd5b09e0602f5/liwatesitujekomemo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f3fa2f65ff0d6340ccb4a0d52827a146/gajimusus.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610afcb56d16f---bujirawufupixaxote.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/buzolixibanoden.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/fafunobodisorinupof.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/vepajasidugonaputu.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/34513648782.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/miriwuxelizedemiviwavi.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/006048af81f4435010f1fdb63d13b984/58745595187.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/5513445035.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/onuq2rg4rqerlq85hb12gj8u22/pepum.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/dirazimirize.pdfIn PDF document text
    • https://arerp.kr/data/file///84695084093.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/95531986499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607583c8f4059---27012457603.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf910e45e---54467788157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=simple+overnight+oatsPDF link annotation
    • 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_off0000bee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 15448 bytes
SHA-256: aef9b0e8b2c316f14c675db17b8828a80be728ce4a88e11906407ce03d590b60
font_02_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 10840 bytes
SHA-256: f6295543867bb9cdb347e7c3c7c523ce0f782ee42583a2740df5b64bdb04f5e0