Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab946024507fb93d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 06:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5df42b9e3df27c6eab3df1a3964851a7 SHA-1: 7a12f4909eb61aba31f8d17e1add1ef5e7f674b0 SHA-256: ab946024507fb93dbcdd6952fdd1f446abd2b76362b31ac57d1134fc53573c68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=isaac+carree+her+lyrics PDF link annotation
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1924333c179e52f2cf6600ea8e970652/9085366622.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/mewomixuwe.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/liluvosofase.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/51724040196.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/dowiruvasidekositega.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/genagi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613009935a55c---65941061390.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/60841931110.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/pumudamuza.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ae2e748d38b50c0efc328fcc77ae33c3/tijidadovewigaxotaxo.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210906164354.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/dowaxavenepiriro.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/wagalisivopifolufifokixi.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/wozadokufep.pdfIn PDF document text
    • http://yuli-china.ru/d/files/finawepak.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109080849444166.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210905023059_262807902.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/tokoxapadawedumevazejuz.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/017cb36543c64d276c010b9cb5ff444d/sukosuj.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/62784121395.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/wofimenuwadejekefimanoram.pdfIn PDF document text
    • https://flyags.com/editorResources/file///92472253793.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/xamibiwenekudesuxiwukig.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/59954411656.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/wanawinobigavepu.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_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 19472 bytes
SHA-256: bbfdb90baf8a11fe0123dab0e19e4ddeda9023841dd5265d495af0c7789f345f
font_02_sfnt_off000125c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C1 10072 bytes
SHA-256: 459cdc39af31f1f6f799545be6dc70fb2431e28f1a007c87d82a3d2a4c3336ec