Malicious PDF — malware analysis report

Static analysis result for SHA-256 9207b390b3f218dc…

MALICIOUS

PDF

121.2 KB Created: 2021-07-26 00:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd19172eb35b4d8afdeff0f00797d293 SHA-1: 8a1f80da19b2b663b43f9b5fa88c955fed8cba43 SHA-256: 9207b390b3f218dccb99ad78d2039325e2c0877e9462bfd7bfc29a16dcd19e34
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter specifically identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9665

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 http://boschvietnam.vn/files/usersfiles/files/vezufebebik.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160796e9ec1fab---91364454842.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/34152929117.pdfIn PDF document text
    • http://chinahongji.com/d/files/48521721826.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdde1d0518a---82806466322.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/43232913937.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/gekomigokivewuxuwuli.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608208393839b---20775003243.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zidozaxojinerevoparuduku.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/46967664395.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05a2dd59d8---70498563289.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c70dba4d662---gutibisanimukaxovugenewi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6b9889c62618dc70960608b6aa229f70/23669757202.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/xexiwewi.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/devus.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608826a1108f0---jenefumovaradezufulosa.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aacd4aef5a---77181271565.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab3e8adc8---gibixefedos.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/44013685950.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106231430041179.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d18b780f6---4232563642.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2891c1ef57---takemorugabuduji.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/31871261815.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/62831406475.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95931b2ca---76622004773.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4c2ab1e0dd855927e99ccfe331c17c34/jusajubasivipumujado.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607165ef3b4e8---82422745906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+meaning+of+islamic+name+tawbahPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000142f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x142F9 27968 bytes
SHA-256: 664be083a9547049fce190b187bcd32b1912a0ab1ef702b21aa4a16e969e190f
font_01_sfnt_off00017421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17421 10904 bytes
SHA-256: 700b01205f5b2dd425ba040753a3f526be04f1040db50d9e82f2a75bf83841cb
font_02_sfnt_off00018d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A555 19328 bytes
SHA-256: 2b4e28a928c82c88a0dfaa1706493dfa10f13adc5de28c2a3a658ac92b2bcb60

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