Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e31a3a9e03423df…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 02:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc071bd4303ae2e332c8de27af7e44b3 SHA-1: 42e94cee16d4ffd4035fa5cd45baf88d9377a206 SHA-256: 7e31a3a9e03423df74803c8f13b882cca641325a799e99bf3623c8adfa633ab7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=tom+and+jerry+new+movie+watch+online PDF link annotation
    • https://mimpishio2.net/contents/files/11731405602.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021982048165387.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/25790957669.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/rkoh3n5iuiu485jn6ig73q5uir/garolijorusifepuxatugur.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/87936670113.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/pijag.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161346a45859b5---xemadudik.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/tebamutadovujos.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091906132528.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/28567203139.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/fafugokavajusoxunisexuma.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/70070261460.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/valel.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/76912728022.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/94590630117.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/silamegovufakad.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148daebece82---wezajazazudarujo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/136a6a383603501366b09200b0df8f96/rutuzopimimenokinuwom.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/letejisamelejorolop.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/motozu.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/nejufopoxikuwemepe.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/pujonosaw.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/300ba5c28f3e383469cdf6f279d97eab/55054568437.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_off0000d2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B9 18220 bytes
SHA-256: e36c8d67774b6b2a6fe8dba1da63240d2a865f425c21d530a0eb091574039ed8
font_01_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 10824 bytes
SHA-256: 783887b649a272ca1bf0006afeff1d4baca85cef8fb0dbd635c7d5f80da40e66
font_02_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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