Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c58b5a50c73b89…

MALICIOUS

PDF

86.9 KB Created: 2021-09-15 20:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 520c8d1c86c7795fff47180ca6a8f757 SHA-1: 255851b269194c4bf2f2084a4ee9c16455ee3e55 SHA-256: c5c58b5a50c73b8972c44ec859cb69d7f5ea4f40ed1d18fc28ad159d1c2e9d6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=free+apple+card+codes+2020 PDF link annotation
    • https://caror.hu/ckfinder/userfiles/files/16564731340.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/77377412240.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136e74d4b9a8---17694571980.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/jevozapinigusefamez.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/digafunapebiriwojuga.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/88496043957.pdfIn PDF document text
    • https://teamcode.net/upload/files/bodejuz.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/muzowibakirozekiteke.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/forifojediwujatabapuxepi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/39ae1o9ktgok58i1o2ttos8hk3/45150599919.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/sasajanito.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4399feddf554b3e98014bac8f0fad11/setadasufujexok.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210912_230009.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/2e13b119df4e6619a05ea2890df57840/guxakamasisojad.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/pinozafo.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5g1hoot5giv473ocibjflaiujp/wenoxis.pdfIn PDF document text
    • http://thevalleytrader.com/files/mapevonevaniseteki.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/16224479712.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210914/file/lizuwizovilibipepe.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4990d621fec46d4dedc5b579f72d1c52/95820480.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/55534318082.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/nesodakuku.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210916_DE3AFC8D469951A2.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/gofebawib.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_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 10432 bytes
SHA-256: 135c195c7cf22797f458512faedcb0be473b99cf93c38a83fb06ff82f6fe77b7
font_01_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 17472 bytes
SHA-256: d789f8c2b3777b9fdd8f57333a6d13f438cb4685b15098bdbedd9c2528e71a3b
font_02_sfnt_off000135fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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