Malicious PDF — malware analysis report

Static analysis result for SHA-256 b881bdb7a01417d9…

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 03:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c884927a0c02ff0d50ec06435d525a9 SHA-1: 6cca8accc16186057ac59a52410bea92f081bfa7 SHA-256: b881bdb7a01417d981f96dea72c5d5532e38e502e9652763a6d5a2d1809a1272
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crewmak.ru/uplcv?utm_term=density+and+conversion+factors+worksheet PDF link annotation
    • https://vntdc.com/upload/fck/file/15909239901.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1148e0012---48270517465.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe3e3b6b0---93685038041.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/85074117800.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe7cbd8a11---bilibarize.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/qbcainn6c7k9puv5edk49su732/kakiwovubokozelidininepe.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/48565480000.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/91394000688.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/23478243328.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/14303a0722cdb7ac364dae035934f920/36373912457.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-8-21/20210821123522687453.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/6466555606.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/27009405438.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/47222550587.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1bf741c18---53783701677.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/zetewalovudewitewimozuvi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f1806098f52---71810033197.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6d012c51a5e840ec440286040bc0118a/75634143004.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/xapepakofurok.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6bdafb75df12755e908d3db81e862bf/84165204419.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/jejezemosafopib.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/27244031554.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_off0000bc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC47 10884 bytes
SHA-256: ac9629232007b25b4a00ea5d053bc01fe07778c8059cedbbe7f215cfb047829c
font_01_sfnt_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 17556 bytes
SHA-256: b8932dca313cdce66b06fdd5b026ccf1a68b69b682d0cd3ee5b74468d4318a5d
font_02_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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