Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cb9d507a6b9a30…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 22:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9dc79be12181740e6d5c176959b52365 SHA-1: 436def6bafdab5904e5cfa248878018e90bed3ef SHA-256: a9cb9d507a6b9a3007bb56bf9a9a4c6bb616bec59c76a9d85abdbd5c077331a5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087fab11a0bd---teledovoxilapolenudapi.pdf In PDF document text
    • http://lungshingcentre.com/userfiles/popiwigakozuwebanikizose.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6dc4724e025315aab9ad978d28fd8989/1818721288.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/nopejotakamajeputadejex.pdfIn PDF document text
    • https://kham.vn/userfiles/file/porelari.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae212ea4c2---rexukisadakukovenuk.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/klfjgihc004jttmr4v168hh4pv/sinagitegokukuk.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/roranasimoz.pdfIn PDF document text
    • https://renault-service.com/userfiles/13480456303.pdfIn PDF document text
    • https://shopabrang.com/images/files/vibuwonokelozafanim.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/772ba262f09b8ac45996c893435babc4/85250891645.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16079d0333590b---jufagarakem.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607846fa65407---6951700223.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e3566a1b---sozadaramituronixevigi.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/fupisaki.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/41428216063.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/17739551490.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1a5713f4d1498d625fca378edb77143d/33114119655.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c163ebf2e4de3dcd240430f8531eff5e/89840619500.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8dfecd00fab4e454bfd7babfe44a1cc1/kowudixeweredoremimupoliw.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f459d3b860---vujulovil.pdfIn PDF document text
    • http://learningkey.org/userfiles/81113146299.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/afcb6c0d46fe0418f50f19e0f77e0a94/27055608373.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/witikosafap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=air+travel+with+dogs+in+cabinPDF 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_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 10920 bytes
SHA-256: 4fed5443c9d7c16dbdaceaa8cf0134df2f8ae5021ef0ce121fdc6dd84f4a617d
font_02_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 17068 bytes
SHA-256: 189c68b0eedd34396661ad23a0bfd2d29e865ca9612aa460c5d986f11e396cc8