Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f5c52308d53a8c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-02 12:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d77eb8b8d1ab3193f095edee07bd4db SHA-1: f888431fe0a7d6fc7ec57b5480e9974277edff20 SHA-256: 42f5c52308d53a8cd516183d86ce57eb93787464c68e0edb426c84fe78c2ff56
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=pvc+greenhouse+plans+pdf PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd360befb1---2368569672.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dde77b2122---62406805794.pdfIn PDF document text
    • http://adveotec.com/img/file/81705899452.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/rh3d8626p8ss1bu2d51i90gck9/68408128634.pdfIn PDF document text
    • http://klenderbio.com/upload/files/77206470819.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/makokabusujasunutu.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/91167098067.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bffce72dc---zokew.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/ninabopan.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/17920010242.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0def79f6f---luwovonupafixirukemav.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/lerenawami.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/ganikudufepapobidixagi.pdfIn PDF document text
    • https://jagominum.com/contents//files/17484842798.pdfIn PDF document text
    • https://bataretak.com/img/files/file/90501924810.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/29888830729.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc64dfd1f---53634214843.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210707080838_acmu1a.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726e20c58ed---sugabugijirolarubiwewij.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/73079338183.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/8974626115.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/45002373002.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/notelapatide.pdfIn PDF document text
    • 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_off0000c494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC494 16856 bytes
SHA-256: 182c4c5d9cc3dac36ee32e544c09e731545972e8c665f0e077e280015be1f547
font_01_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 10876 bytes
SHA-256: 8a86f0f74d02b0885f7f80f20c2ea76746fc03e5f63c7b6ff1607c83e505b1e3
font_02_sfnt_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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