Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a38ff4a0b9bfa56…

MALICIOUS

PDF

70.6 KB Created: 2021-09-07 07:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7222ce75014f5b8ca8fdbad5e53bd9ba SHA-1: a6ed9e9a98ff21b6d09fb7ef57d3a10f46c8108b SHA-256: 0a38ff4a0b9bfa5632c73019c8b6317d0a9b9f31d8309a848af2f629f7f6fb90
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/koxowidiwejezapipe.pdf In PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/zakanumirowivaderevujexek.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/jatisa.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/59atl0jglca62o8nche2efsv8p/moguziguz.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f407c2516e---96231636970.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/bamazaxijino.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/74482267811.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/57772043163.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16080c86d97252---pamalojujukukujo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a29351a55---38688279900.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/78596770298.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fs5c53inkp92509ghd2s3udra6/17862311518.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tuxozo.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/buraxubedisoxogol.pdfIn PDF document text
    • http://asqcert.net/files/files/34893835879.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/9877146473.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080629baea9c---zevoserubanapiset.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/lupozudojibinepa.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/zivoketitupuwagitabaje.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdc54e7096---gedoragadosogujidumataze.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/bef3f8a919c7962725e3fdb3782eb3df/lekalaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=xmind+manual+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_off0000b6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDB 10148 bytes
SHA-256: 3119a4ea2eb0e6d57ecf230a325fed91ca0b0002edea458c2a57eb2ba6df3787
font_02_sfnt_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 15472 bytes
SHA-256: ee2526776559d34f51cb23588261512fe01d0cc912e45ddee5d3e0d81f4a9a09

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