Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7897381d28add4…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 06:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a2cda5e73d7ff021a7de1a185c2a078 SHA-1: a0f331beb76175af19837efacc7c87342d165a8e SHA-256: 7a7897381d28add41516a312a766b0c5df62e7884efbc15b39faaa03adc70157
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content. The primary IOC is the compromised WordPress upload URL, which is likely used to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160723af749298---41993903330.pdf In PDF document text
    • https://best-label.com/upload/files/31787206754.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/45947422062.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/oab53j80pgn4ltjv2se30bsdl0/73186165221.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2ca3d205---65458356883.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/4319945516.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/7245382223.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/mowumoleperuwubodotu.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202108312321449212.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/pilibawupazij.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/jakuzusazusiduk.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c460cdab06---79948425652.pdfIn PDF document text
    • http://sooclose.eu/upload/File/nupowupeniwarixozab.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/vimobanojefen.pdfIn PDF document text
    • http://www.asslar.de/downloads/83436680114.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607145b9b58e3---mujedonebivenebawinagida.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/1jq5el8jo3qcmvsgh1i04r6jd7/wakajogozoro.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/08/10/58895929976.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/oqc6l794bcev30l31c995pn364/taxesupajil.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a6513a7e2a9c22a840ccee3b8d1380bf/ruruwimuxodowu.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/16128852816.pdfIn PDF document text
    • https://digireg.cz/upload/dipopinuziwezetejevonilaf.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/denip.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842715d9123---dunokerewok.pdfIn PDF document text
    • https://rjpexport.com/files/54247924286.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/lipoliw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pale+skin+and+red+eyesPDF 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_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 10228 bytes
SHA-256: 82d547fa803b88dba3a03b6b90de1b7d83e14442864a3f3b8729e7940633d579
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 17460 bytes
SHA-256: c1edf4c9f4775fa56b367dbdfdd6e67dbdd06f5512db217f461555a2ec9387aa

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