Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae0df6c3ceeebca…

MALICIOUS

PDF

69.3 KB Created: 2021-10-04 07:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f5cdbfe8fddee49eae3af3ef7d014153 SHA-1: 0f658ba7e1b5efd66d5c3295ade44a5b4d5874fd SHA-256: 8ae0df6c3ceeebca3127b28d0446585629f805ab2cd645c293a00f9ea17d68d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic further suggests malicious intent by pointing to compromised WordPress upload storage. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://winterwonderlandzundert.nl/uploadimages/files/33794909140.pdf In PDF document text
    • http://intemhathanh.com/img_duhoc/files/62831093431.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/zimiworukebalabow.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/vuduno.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/biworufosixadeletejiliki.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/kafawovolukagitap.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/15504751165.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/20108562422.pdfIn PDF document text
    • http://cecev.com/stockages/files/xukonu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f20362b608---tagujivibakidufisog.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/36781214178.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/kenekodaberavetafe.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c503404ffc---75853068273.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/240210249531.pdfIn PDF document text
    • http://budget-pl.com/ckfinder/userfiles/files/venoluzenupigonog.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/29305020811.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/gubibumokanif.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/zedet.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/wubafezolowugozirexux.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36204028e---dezovuwuleno.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/doredudaxinekobovodonag.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149c03da72ff---39434918091.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/79349639716.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/lowegafelekiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=meaning+of+dissapointedPDF 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_off0000b2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F1 10520 bytes
SHA-256: 1e879085027cbfdd899927de13b67b4d141cdf53332eb34130dddee5c74d309b
font_01_sfnt_off0000cad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 14452 bytes
SHA-256: 5fdff7071ce56e74609832ba077726f1ff848bdb6a12575c692e07753a113dcf

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