Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a3fa159bcb90a5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 13:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1eaf29faeec0dce682f53ba4b8e1e8fe SHA-1: 08024250a68bdaaa8597574814287b59b1d35426 SHA-256: a1a3fa159bcb90a5e4fc32bcfc4353b195d856245c04a4b704d3847d010fc433
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or malware distribution lure. The presence of numerous URLs suggests an attempt to distribute payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=mage+defense+mod+apk PDF link annotation
    • http://syuncyoku.jp/upload/file/dakobuxovimonusosevi.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/gorewik.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/nujotinaxopekowurejiliri.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/10548638231.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d7457f62---92297586239.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12741186196.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/54e8ea40162ea6d7124eb69026abc1bd/kobarikovepiveganavegele.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/pidazawufa.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/mulagodovuzufusolurive.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/zadadefubire.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/44475245507.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35bd47717---43870597167.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2a06906df---23655150.pdfIn PDF document text
    • https://halkum.rs/files/92960750075.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a861c07b3e---78235042719.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/77033009861.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/77251593673.pdfIn PDF document text
    • https://istanajp2.com/contents/files/64714604128.pdfIn PDF document text
    • https://rm-parketi.si/uploads/fafigulazisesedo.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/deduwufema.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/vuguwe.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/60090846909.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/32028125174.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090901300473499.pdfIn PDF document text
    • 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_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 17500 bytes
SHA-256: 8ca3ca06b482ed698caae7a7cf450c5d51d8a36c624c6f1aefd478456b2773b5
font_02_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 10592 bytes
SHA-256: bf6fc21e407c7e8e47da8d7de7a69e67bbfdd5273791433edfc239c6ff60c431

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