Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f31d4e85e48cbd…

MALICIOUS

PDF

134.2 KB Created: 2021-05-15 15:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 820fe338cfe94d976b5cbc855a0b90f3 SHA-1: 1eda51daa0f8f356f9e9efcaf8dfb107d702f8db SHA-256: b5f31d4e85e48cbdbb2f03f710876cc0bf152b82bbd1b4a2e0c185b58be07e12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially garbled, references 'Hotstar app apk', likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2g259p1bnd4l21tdvoh73l90mj/kimoruwemilojavejagol.pdf In PDF document text
    • https://cardion.dk/gfx/fckimages/file/betexeviwotadobejurorijo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/suravopulexirevubowawew.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7760dfd9---wugawizisofifapuluwuwel.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/jokipake.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/0b38c09eea76c36bf61890ffb649b450/figizepoxutamumew.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/70c5c60142d8a886ad57681c21e623a4/18535504839.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa65505df---90810648683.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/01f01e8b92e9d23c7665868c2d27c5fa/38523905593.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2a3f56a5826d6ca6209ed0a2a155af68/75005259874.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/45873342756.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zupujerakoperuzalok.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608046bcc07b8---faxokomeponofifufided.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765f58a11c7---59263777950.pdfIn PDF document text
    • http://charivne.info/images/file/fenobukimi.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/665118e9b2b96d9147208b1939d70e1c/45987384753.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hotstar+app++apk+7.+3.+0PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A0B 7580 bytes
SHA-256: 7ab7e9c0dffb64f6f75a263eacca029cca11e35803d089cd1e1b91f22448a333
font_01_sfnt_off0001a3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3BE 5224 bytes
SHA-256: 187dc391dd3f310a805adc6967f9ba1c80238d30a0bded18e5cf333a3009dfc8
font_02_sfnt_off0001b594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B594 3312 bytes
SHA-256: 8d141df42e0fdfadc9d70cfd384090abc84ae149e0846575e737774d2372c0f5
font_03_sfnt_off0001c387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C387 16040 bytes
SHA-256: c5495f52dcf8af2c0f572b5b94689b8bd9dffb7e85aaf94f46c943a520741c4b
font_04_sfnt_off0001f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2A0 16380 bytes
SHA-256: b2a41c4a531be3cfde6bdbc17423237f7a32880cd442110f1fae3a97b831fcf8

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