Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde8146bef9dd1b3…

MALICIOUS

PDF

107.8 KB Created: 2021-07-07 13:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a27f9615b8ae6aede597f6426a8cb5a SHA-1: 6a40a9afa35bcdcf7ad107ab1440879093cbfd98 SHA-256: bde8146bef9dd1b3bef9494be3f26dd2ad36880fee65671bb3ad8d67b9037b86
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to phishing pages or further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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://hongshengfish.com/uploadfiles/2021051606312184568.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a800ee0123e---93580756585.pdf
    • https://behagi.eus/files/galeria/files/nisazumikipulotakoxeteraj.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/sjafug81j2449o1o0l07aafi1m/1240117639.pdf
    • https://blindnow.com/userfiles/file/5962408559.pdf
    • https://warungmimpishio2.com/contents//files/13976257962.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a41d1a0e8---72966491670.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607555b7d554c---1351093441.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607018e933637---27464865629.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9463427063---luxeditupefororefixazazo.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2f219b7c2---32847053573.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2bbeabd31f72a37c8b7c57aac5fe2d86/deruvabanotixuzokisubasoz.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2b570bd8d3105d3a67583f75e440acc1/95217046931.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a23a9cf62---sajazazilik.pdf
    • http://st-communications.com/ckfinder/userfiles/files/kuzaz.pdf
    • https://betenenergy.com/sites/default/files/file/mirodunemo.pdf
    • http://denge.aero/upload/files/83602618618.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090f4c454800---35590235028.pdf
    • https://classconnbio.com/img-jacson/files/fiwoduja.pdf
    • http://haniltm.kr/upfiles/editor/files/dezujikufovibabi.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38830d068f---tanoxopesenevojamini.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d54db6324---37763528132.pdf
    • https://miet.hu/kepek/26132480843.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a40358187---matumusazalisomiluganab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lesson+9+3+composite+figures+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011522.bin
49fa1f0d71944e5a28bdaedb8c2cb685e0e08ec5ba03498dc7138ee53dbd0631		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 2088 bytes
font_01_sfnt_off00011e82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 16792 bytes
font_02_sfnt_off00013699.bin
bd29582d05e0b73c73b63a542a6b48e8e05c4cceb608419df936da50c209d6c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13699 11260 bytes
font_03_sfnt_off00015120.bin
799ac7e1b99d2bf99930608688b3e522786e705f79a055a94941eeef1c42b853		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15120 16632 bytes
font_04_sfnt_off000168be.bin
6ce56e4de939d22edc2392e513e92d423c42f50e7b29c418e7ce8295da7e91d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168BE 21204 bytes

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