Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f39dc72b7da9ed…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 14:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5800fafe5cd5bbc1acaeca09220fff2e SHA-1: b86f753fdbedb52368558d021d27fad2f23497b5 SHA-256: f7f39dc72b7da9ed1617fe546e98e8e12eec0a88d020f8354e124a85f5ffb7c6
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious link farm and a lure for downloading files, including a 'password-protected archive' lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs point to compromised WordPress sites and other disposable hosting, likely serving as download locations for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=gta+mobile+lite PDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309e14a3e6f---pitaxoluxibavupatiburu.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9deacfeddbe4f5dba3069040db76cbf5/75779058584.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/zanuvawixuwarukasujaru.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/debugepexozapelago.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/37424843303.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/safilovok.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/pupizimukesijitotewi.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/xokezufovexaj.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1fa1aa386---91970276093.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/xijejoboxoku.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/zajugeziwudug.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447f797ffea---55259126444.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/38816170131.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/sujaferajif.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/66ad0aac831c14cf959064d884a803e6/jotonujididet.pdfIn PDF document text
    • http://stylekd.ru/files/97734731955.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/libasuzokan.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/sodapanewumiloterabab.pdfIn PDF document text
    • http://rld-carbon.ru/file/nitelidizi.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/74713353465.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/kamitovototoxitanizujot.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37aa44d7b---dulax.pdfIn PDF document text
    • https://businesslife.com/content/files/4905250020.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_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 10076 bytes
SHA-256: 0661f9ffb4098a76a0b1b550ffdd0331863109c781f79bf02b6527d2f49fe64a
font_02_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 18244 bytes
SHA-256: e2486f7b075a76dfbe642ff810a008ca5592752ad1e8d5ea8e76220bef239beb

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