Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82d1372214238cb…

MALICIOUS

PDF

88.4 KB Created: 2021-08-04 14:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 06207f285a6439217d557498087f32d9 SHA-1: ab1865387aa06d9f7a502470981fdda7e558dc6a SHA-256: f82d1372214238cb84ad31034b71ec6cc45e64c4b919b97278df08a6cd5b0ca7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae540a13c27---xezuvogomowutejapije.pdf In PDF document text
    • http://boathousebrokerage.com/userfiles/file/rapozidetevugavale.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160842b29b2edc---bezazifirovijafisururoni.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6be73106e---gugobevikuf.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9d71b4453f261e8e7a969eceb3b8415d/68241101855.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087ae5a5c056---tigagosawomog.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/93164844907.pdfIn PDF document text
    • http://keramann.ru/uploads/files/jutalirer.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/65868788898.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/36474811540.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607316324fcb3---doxavusokonoxa.pdfIn PDF document text
    • http://uchid.com/uploads/file/bizomuzijitafaw.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/6362844418.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zojivukazidovewidiful.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/pimasada.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/dawixuxefik.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd657b0f6---72028530585.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-14/20210714134527688753.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/najekibede.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/savojelumivulafifenojoji.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/31558094472.pdfIn PDF document text
    • https://area5srl.it/file/zebenisakatatupovak.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/jadumawo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4dad388d---pogamobowexenarepotibino.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/83162017507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=definition+of+curriculum+evaluation+pdfPDF 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_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 10780 bytes
SHA-256: c8fe26c8f021ed55b497fc11edb27fd58b39844ef3a772584285c3103b7b75d6
font_02_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 16820 bytes
SHA-256: a76b8011cf148906281c0e8eaf184846d6de863eae9256f92b4d14fa1081ecbe