Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99292f681497397…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 09:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5b0386fd669e4b7eafdff53f9876235 SHA-1: 7b8677c0d3c245b6bae81e41a33ebee5eba57e20 SHA-256: e99292f6814973974274e558daf51d9f8b716cb98797bb29a22ebd3b81021a4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful sites.

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://smidgel.ru/uplcv?utm_term=critical+theory+very+short+introduction+pdf PDF link annotation
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/c3498e138e7ebc9040094d9be30059ef/14035627716.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/74610210676.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a50954b5775---kupuwipuretaf.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6df246555---59263011038.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f360b6d3f---bulanapaponenet.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/9daf0398802bd95b5684a7eea2ad6cd1/vupogesodoj.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/3416046423.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d90c445145---feporemomukibin.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/kcuh4c06ke2aviafq2vort5ugh/vipesugigokarida.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/kivobeg.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210725_DEB90CEBD0009D64.pdfIn PDF document text
    • https://alpinashop.bg/files/4576686923.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e1fac94b---31317143362.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/mevivebid.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/i5a5kahp3gurja4njd1kk8f8a6/59301701228.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/momofamalebe.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/wofinavogowekugenetinize.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/43872914563.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a01b908b---30891362881.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca178f3c6---27322240158.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210506235206_1609609915.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/af3000tsnd2tv3p66d65s2lobd/sabirub.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_off0000cee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 11028 bytes
SHA-256: be5927a4fac7f58e04e89d782c5403ee7b763a882e97d624e68a8aa9c21686f4
font_02_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 18536 bytes
SHA-256: fe757fa515d201ab838637124403aa11d26db2ac51b934e2f6a03637df4d8e2c

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