Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ec2dd8dee38725…

MALICIOUS

PDF

89.7 KB Created: 2021-08-03 09:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7cb22cc5b22e5d1acf3434bc222518dc SHA-1: bef4a7ee4a169c3f5b12445f59b655014029b071 SHA-256: f7ec2dd8dee38725c8b6709df2e5766152fc614d54fadc1157b2d551ad6ff443
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content or phish users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://pharma-tools.eu/galeria/file/tisuzotuwurabodalakuxiro.pdf In PDF document text
    • http://vkts.se/userfiles/file/12704999892.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c30611443e1ae9d7360c3ad2edfc246a/24796970883.pdfIn PDF document text
    • http://unseretochter.com/images/file/67115992193.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/22218175957.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/soruloxorebolosazojilex.pdfIn PDF document text
    • http://fgosvo.ru/files/files/bibapejawijirurad.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c330c5dcf3e---48378220505.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0618cedb---38696469952.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/bidisasidetoda.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/857663460470f5d4a33707af00a1a0b7/bapikapuxejejefug.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/rozuloselasesukofe.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854163f0f8b---bimuki.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/pozopanekatenulagowabi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9848fee803c0700b4a500b8c88bbb380/tivusexuzexiwawew.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/556dd67f23cad979a37bd24eeeda2140/34320735405.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/93993329273.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/27411829958.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/50735576665.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/250449154003.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/jorafujudivazudubilux.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/7609550311.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d44c026562851cb07afa677f1159e805/75959577564.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/kogiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=granny+mod+menu+apk+1.7+3+download+latest+versionPDF 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_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 19136 bytes
SHA-256: 6bafff7b6274678df03fccdc40f4c48bb834029518eb697748bf51b88299afe3
font_01_sfnt_off00012584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12584 11392 bytes
SHA-256: 4593c0c482f999f48351693058053caaf17d64c7f75f1c4566dc323e05ed00fb
font_02_sfnt_off00014091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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