Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d37aabff03cc77a…

MALICIOUS

PDF

82.8 KB Created: 2021-07-14 06:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 484734153bbabe8397caf9ad587e4e67 SHA-1: f926e908d45836c58dc941fe2789e3969795d243 SHA-256: 8d37aabff03cc77aa82730e05cfe31e3d2e3301f8906cd30a70391ee3eb4f12e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/fd231c497b0dd161706cfe3ad82effc9/mesugori.pdf In PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/1s79d7v6b2dfactf9grbhpid06/parufezelaluparaja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded56a7947---85368554512.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/31108045174.pdfIn PDF document text
    • http://funperm.ru/content/file/51631266171.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7292dcf4cfc97cf7a357dec4abb8bbf9/jabasavejesadupexezem.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/b0jb09gba5pc6r6vbfcuk03bdc/venisevesapipijurin.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868cf02dfbc---komelupulu.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lorojukivadugudivinek.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/90197874312.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd346b8d8e---felivilodujupelujitaxabe.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/63717870224.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b02e7ad75---mivumutofasesifiloton.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/93987894549.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/95f33048c0e2645bd7792892a1a8a5c5/gozodusaxezedofuvedisut.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf80aa14c0---jawenepujog.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/lijelesulerirelelabin.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcf88626ec---wifeka.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5b5b29cda09f41f810a51e76d2e3a0e6/tipabumamudoxarinunagita.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/01f3f0ea020cc5fb9b26ae861c1a6fbf/61432167571.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a56c0c694---gasonaj.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/72528956834.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/kagig.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f39092fcd8fd4fea6880247879268846/92243113901.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/16885653461.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/bulininavirepibedidul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+manual+paymentPDF 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_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 16668 bytes
SHA-256: d027330aee68817b5a8ff757757d787a820a93a4de98bd275805946cd2ef68ae
font_01_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 10504 bytes
SHA-256: 7bd81e30a3f45ef49eb6c3a4f737a7ea830e43c5e4ac7d545740fea801a64f09
font_02_sfnt_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1