Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d22e35d779d46bd…

MALICIOUS

PDF

84.9 KB Created: 2021-07-06 23:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3833342681f0d01f15bf400924fba1b2 SHA-1: 967bc8994a7b0caacf64cce016a2e33870b6378b SHA-256: 9d22e35d779d46bd6fc63424438f26bdbb4242cd15cf8a78c3d0b2c4732eeb95
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs confirm the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/2919d9b1d74f72eaceb26817c84a9e17/toledesadejenulomuf.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9ce3447347d061f3765f37d8253191d8/jofoli.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/e7duv3guqeusv2gcaku7p199b3/21976270764.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b940a08bf---medokojabozuzaritefabonow.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/knts5g7a5pco82q1lto1emrhs3/15514787885.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622316308.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e28bab71f50---seludasejofowifijikipo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9e6074eb91050f7b30296048d68ca212/divikojizabaxuxomajalalob.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/26/33154186440.pdfIn PDF document text
    • http://leton.pl/userfiles/file/83470191495.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8514ebaa4---famekaxitebibi.pdfIn PDF document text
    • http://rapet.hu/files/78257353019.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0612d01fc7567682395ca9af5696287e/70234167942.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/vos10j8mus9urv1dedmo4f55hm/77868077990.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68d7c22173de1db9895fd57826e9e7eb/69509241619.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d22e9a762cee7be954419667264914d8/27444196904.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/lusokotumurabojotanarivo.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/76fa41a90dc14cb8d0faa9f4309521cc/baperolomopokuki.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a85c3ba08b26086057d70d7c963e9fed/zutitad.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/lerigipigedaxefozavup.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bc10cef2---25959751209.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce15633ff---63022980713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=without+me+alexander+stewart+mp3+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCB 20284 bytes
SHA-256: 95eb81879839200f20beacf7ad3339ae175461cb1c593dcba53a87efa71e2b89
font_01_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off000113d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 11112 bytes
SHA-256: a14a7e35d9a8dbfa0a881e472e85070ca10e23b03b24b282443cd0e8d1acfd46
font_03_sfnt_off00012da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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