Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b944830c98ccf9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 06:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fe898754d6b8baf062e77067191dc342 SHA-1: 0bd4f9eff10b8af5b4c552ec49caefcab89ab098 SHA-256: a7b944830c98ccf9d8dff00e037bcc8f05842f58d8cd0e3cd59af42e534ad891
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=higher+order+functions+javascript+pdf PDF link annotation
    • https://atrax.eu/userfiles/file/75650086767.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13555752919.pdfIn PDF document text
    • http://kaies.cn/upfiles/210704082354316642kgi4c9.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591f11649b---koxajixelitusadel.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9b51b6ce66afc0b2f5d7ba17365f0108/42283145355.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/9d2b20876183a0c65619ee37a13dedf4/titizuvuxaferoban.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/guxuvoxebusesudi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914a7992246---nodasaximinibu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a291a316da3---nereke.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/26127606520.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/danisuzabu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e8633c13f6abcff8d1847e2ca0d40857/pewozibaluposarovuxesebe.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/bakiwosiseru.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841976c6966---xaxikulumapikonu.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/5984509359.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/vadebeponirefewagozopuret.pdfIn PDF document text
    • https://pmms-online.com/assets/file/33252334072.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/tamubavesizezakif.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/13394084152.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a0e674e0a---56807486696.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/22398048096.pdfIn PDF document text
    • http://healthywithhart.com/res/file/sezekoz.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071faeb7b580---99993447746.pdfIn PDF document text
    • https://dineflon.com//files/gopujetimeb.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_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 11140 bytes
SHA-256: 039752907779b1737226a39cc377a9cc196f807520ae98946a6850beb58b18f5
font_02_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 18648 bytes
SHA-256: b2803236e7b7a042e061eac8aeb9adf7589512d8a73c2ca97f455b965d6ca6b8

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