Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1069e6c7dba87c…

MALICIOUS

PDF

81.2 KB Created: 2021-07-06 04:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0831e02f4e53aa4a34dd1f191724c5c5 SHA-1: 40d1c14468e9a36d55aaa1c645c1cb551a750cc9 SHA-256: 5f1069e6c7dba87c5f8dbb58b0c0ff73dc8a365d2c2935f578b11c20302b85dd
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 numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of many distinct hosts and UTM term redirectors further supports its role in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/419e8059ed6e6f416408b0b7342641ad/dugizitabanagalijoja.pdf In PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210625074656.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/74283881243.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/22050520682.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a214d5b2b2f---7734130341.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1709d28316---68810833359.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/11645834691.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210626155409_cr7wz6.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fibuzavipodo.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/fudewuvasebegiv.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d8f451a48---57719553006.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/sogek.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ddc19de3---nilurapevenoxonatolar.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085625f8a522---49729648746.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/ridewasiboru.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bebe3a787b---11925320435.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/11680045075.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/989c1ad20cfd3d35326065c5b575b83f/95822378797.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/koresulupivisokizof.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/lotetuzebunar.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfce79cc99---67254552062.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087b08bf2194---71658779240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=town+of+islip+phone+numberPDF 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_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 17384 bytes
SHA-256: 5c3f0036094b37e23df96f5ca2b5b42fc3e23a33fe06ab88e829f1a5a88a88e3
font_02_sfnt_off0001200c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200C 10652 bytes
SHA-256: 845c261877840dd20243423086cfbf0b67923dbc8da9842f354fea0dd8b90b25

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