Malicious PDF — malware analysis report

Static analysis result for SHA-256 c457635dc5cdfa4b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 17:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 532b4daf92a592d212fae315073e93f3 SHA-1: ef3caa73d3e55653197ec717f32feb61dd42a9a6 SHA-256: c457635dc5cdfa4b670bd91801d7300a850cbf2862fd353fb8a2b9673c214908
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://djennebeads.com/nbloom/fckuploads/file/motofetewaba.pdf In PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e86fe55b6---dometodepaz.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/kelebekazu.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/xoxisamab.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/kidigupiwerupewavam.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///53343773387.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/tekelevazajijeda.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/25411879333.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae271a01aa---mexigutegexekovixixinar.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/mokagedobelefi.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/sugunebixuwunu.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/rinibulirafoneso.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/35d47f8dbea6f8cc851877d70018eab0/gibelepixab.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/sebov.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b76b44d1e9d2ae22fed2cb06047af07b/xasirogulabinesofi.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/wuxapu.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210801071138.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/7384154269.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5jqriqsrqq0hvdcu7s5m7d2213/57364397395.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/74781989108.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/29217886143.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/61566215226.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/50650672049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=blood+film+morphology+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_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 17736 bytes
SHA-256: 97ce4c73f986bb004caa3eefe6c52ea8231c090ab999a665d67a42a24611e278
font_02_sfnt_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 10448 bytes
SHA-256: b240ca28a45d63f8b9aa5c3ab0b314ecb3c57c1f319b79e191551694bff4f799