Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a81f80cfd1ca1c2…

MALICIOUS

PDF

86.6 KB Created: 2021-07-29 16:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5dd76012c2ff3c3b31aa1fff393eaa4 SHA-1: aea4c4ec80b3bf6e855c2f69ba4f5d8b9a72a4d9 SHA-256: 1a81f80cfd1ca1c212c99c67eda5c91449f3b5957251730083e7f3f954d0605e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated, but the presence of these link farms strongly suggests an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/97911aed1d063c37f1163c318390029c/nudadukaf.pdf In PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/91gohpgtlp8jp6nc4r3t320ubo/3075921575.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5lmth11tf5jk3sogh6tic5nq8/returimibuduk.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc203496397---12773033671.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f1ede1ccc---32720833621.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a091b5521b1---gixijulexufufomav.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/53811553505.pdfIn PDF document text
    • https://hcviet.com/img-phuctri/files/wokesirinivelunimetu.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210616200150.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/tojepetuparadot.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/dawedikopasejogaxo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ce4d86ff---73045138531.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928a842ff07---60867045571.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210716022201175.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/3193937633.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/pbnit7occbif7f42ct74j4f5fs/75982108188.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/jupezekeki.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/38210238771.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/51767108961.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/93667678720.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/15391379804.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/beravuwubaxopewip.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a9b411c5---29640566455.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a574b041dab---79132922075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+play+five+nights+at+freddy%27s+4PDF 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_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 11148 bytes
SHA-256: 27b9e2f9833f7304c9ccaf6bfacef0d3df708184e49d5f4742f05e20fe1696d1
font_02_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 16876 bytes
SHA-256: 794bdcb8ace0b9dbe3cd6022be5213948809cf4d81475280e2d58b90370e7be9

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