Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f74bf9caf9560b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 16:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c6eb3c2ce6abf23577ebb46d623fcdd SHA-1: fe37dbdb640e6add3876f5bf7eb8b6a28b6781a3 SHA-256: f0f74bf9caf9560bbf6b8ba5553f848d35237d8498f4c06bd9e4cf0a45a8a659
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=google+books+link+to+pdf PDF link annotation
    • http://reversetheclocknow.com/ckfinder/userfiles/files/78347706865.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/566501650f3cb9236d03864cf25fae67/30318397647.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/xupabivevub.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/famusite.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/jasawanajegumexur.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099cee37e1a3---gaxiluwakoji.pdfIn PDF document text
    • https://istanajp.com/contents/files/74658073241.pdfIn PDF document text
    • https://codecs.ro/images/file/95131993485.pdfIn PDF document text
    • https://alariel.be/userfiles/file/45462726673.pdfIn PDF document text
    • http://temple.mo/userfiles/file/28865661725.pdfIn PDF document text
    • http://accronline.com/userfiles/file/84475579469.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7728ec8fd6---46555510495.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/losofidikeguv.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3b9e9dfb5---vusoroturigopugorijudo.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/sinefubovamezebolisi.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e748092e9d---kodogixadogikepumik.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/kutpr94jag0kju4oil3t0a6gfh/rapirosilonig.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc491e81d---40669977853.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q4cbe40qr64gouhtoc6d7off2i/nowenexerom.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/relazezujevatodiximukat.pdfIn PDF document text
    • http://amandamaitland.com/images/file/76161811759.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/91789688734.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/42aadde19b2a91ef021f97033e438a22/poluzenedurusijewewiwi.pdfIn PDF document text
    • http://samtekelektrik.com/files/77437851952.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/9794749867.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_off0000bcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 17144 bytes
SHA-256: af0da6bbd1cbbe0633cb8ad28b2723d70e4d99501e02d113ac1b1e719f5cfec0
font_02_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 10684 bytes
SHA-256: 27456c335d3afe6f6153f40a89f8e44451bdb5f0054693a0033a545a621509d2