Malicious PDF — malware analysis report

Static analysis result for SHA-256 678692772898531c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-27 16:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7472a9fe1623977e782921bc6d8baa09 SHA-1: 2eb8b84ee4ba00de0044ee289b055200fcc7d22f SHA-256: 678692772898531cf2e4d301e5328876b1c2ce114a1484657aefc7d937170737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pistant.ru/uplcv?utm_term=motorola+g3+price+in+bangladesh PDF link annotation
    • https://speak82.com/_UploadFile/Images/file/52625304675.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/76284105816.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/tuvekubeduwolutokipe.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3a1a110753c55e44e5c676cf76d546c7/25321323517.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/majiri.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/12415029183.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/fuxerurajewa.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090516282667.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137867d7cd85---sukefagezifumabiw.pdfIn PDF document text
    • http://armanetti.com/images/vogavezopepudenedela.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/simodadafilosaro.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/80601889111.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/940726a30633dd201f34840808af19bc/10867298896.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/sokamitin.pdfIn PDF document text
    • http://vizcsap.hu/files/file/55958040549.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/nolumoxugavez.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/91020891054.pdfIn PDF document text
    • http://schokofontaene.de/idata/76237561544.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161471c83954fd---43935737935.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/6552371348.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/29333957471.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/43442699726.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_off0000cdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCE 20672 bytes
SHA-256: d3ac91ac8f022f1825d074b44f1b6c053118e237ef37e97fefc8b34c10ceb6bf
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 11096 bytes
SHA-256: 4da236735dcf38b561157648a0fd56d112d4fbcd66475266653af091dd4094e7
font_02_sfnt_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1