Malicious PDF — malware analysis report

Static analysis result for SHA-256 f562de51df7990ce…

MALICIOUS

PDF

70.8 KB Created: 2021-09-30 18:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2512ceefa28720c8351e7a4126d544d8 SHA-1: 339bd23522108d6cde2ebc9bc2653bbe5c065aef SHA-256: f562de51df7990ce1642f8484a14dd0b0b5f7e0752540442ba156ffcd6e9357d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these link farms and the overall detection by security tools strongly indicate a phishing or malware distribution attempt.

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 http://www.southpointinstitutehowrah.com/admin/uploads/file/51323700283.pdf In PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/vuturirapebuza.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16321754761102400534.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/xusidasaje.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109281801311643.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155702796530---15644222918.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/fobekegozanosazego.pdfIn PDF document text
    • http://schokobrunnen.com/idata/42023014931.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b75efc5bcaae3fab47d1efa7266f30c5/62561048504.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/zulewuj.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/manavozakalokonakegupakof.pdfIn PDF document text
    • http://c-amc.com/upload/files/mefudonanosasigaruxujo.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/doregedarik.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/suscllvuapp497gh6u7rqubkgb/37189833142.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/71463633326.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/wesikozapejirasifaxipal.pdfIn PDF document text
    • https://el-tall.pl/pics/file/68702886608.pdfIn PDF document text
    • http://355353.ru/userfiles/file/getufonuzemilakisa.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/56190435762.pdfIn PDF document text
    • https://matratva.in/userfiles/file/19462232280.pdfIn PDF document text
    • http://stattus.com/assets/file/roselumuz.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/bodajuvawa.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/vuzegelodedesalomibo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161475ded6d666---buguna.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109290501275517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=300mb+movies+free+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B8 16544 bytes
SHA-256: 3d21bd18b92b94ddba5e37c4cde0f8065e2483737c3906a4ef4fd79cbf0346a6
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 10908 bytes
SHA-256: 94571a10f37ec334e9510d5ee6da205f4fd7f33a5b49fe38d25bcaa09691554c
font_02_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1