Malicious PDF — malware analysis report

Static analysis result for SHA-256 537a3d2fce93cdcf…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 07:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b825516c52696752d3b6a6e8ded67712 SHA-1: 0cde2986f146f771d00c633887d1a37a17cc0c92 SHA-256: 537a3d2fce93cdcf608bcc00d3beadfb64816d9d1ac3676a3bd72b0f84c889eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://barrierball.cl/ckfinder/userfiles/files/gusakejexitotada.pdf In PDF document text
    • https://torgradio.ru/new/files/file/87714689316.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/54447828532.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160721bdc153bc---zabifugixupejuwugev.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/rofagesulaniluni.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d5096620f2c7adcffc551d2d32503c07/xosemanurunirigemarilosel.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/tomesiruxofodavoso.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/bakajal.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da702ac3b4---xibedofo.pdfIn PDF document text
    • http://labsshop.com/d/files/josojogutologedupi.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/filuposabemaluja.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/revajamovev.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/32268256267.pdfIn PDF document text
    • http://kientrucqhouse.com/uploads/image/files/jokadot.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/41118755869.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/49856191072.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/89038631907.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/65765700099.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/ralinibeveketazi.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/23248400928.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5ecd78d377d7dcd8357878f0ee339670/xalulefosokalofolegarifen.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e3a13a3c---39424364263.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/8d37f1bd9e687bd09b60a5beff76f5e3/7509857069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=diet+plan+for+diabetes+type+2+pdfPDF 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_off0000ba2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2F 10868 bytes
SHA-256: 7237d8671350d80b7aeb691a91470e44f89d0d405cbc39a3913c02f025415180
font_01_sfnt_off0000d342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD342 16836 bytes
SHA-256: d04fecaacb865ae323492d6677468c9b814fc8922cac235ce9f47aadf2dbf261
font_02_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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