Malicious PDF — malware analysis report

Static analysis result for SHA-256 f817f0048bf7728d…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 08:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7ba2cab19c1c99b52ff0b9b9dd4408e SHA-1: b400278a9885dd2e96981de379496863d5067e43 SHA-256: f817f0048bf7728dfc77b99417b4eefba22bb84825c37a07018cfb0971792775
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=lenguaje+musical+ritmico+ediciones+si+bemol+pdf PDF link annotation
    • http://solee.cn/ckfinder/userfiles/files/bugef.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/zezemukomoturewu.pdfIn PDF document text
    • https://synersys.fr/contenu/file/lewakumamawidisif.pdfIn PDF document text
    • http://asmolmerdiven.com/depo/sayfaresim/file/pinusipisovezizudetopu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/bq84altsgmgpcdmlovs4vrkjv4/89477675910.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/fomagukuropaxogebap.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/71106957784.pdfIn PDF document text
    • https://paradigma.bg/uf/file/30714321933.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/bifoxalome.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/62700367724.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hkl0fsia53m8tfdd038qvv3i84/pazexuvawenebalopukikusaw.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/jigajuvijezobezofeda.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/jaruvefarenoxifofetenupu.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/lowokiwewozixewetilijase.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dp5oa4ehfdiakqpihq16vln9gk/roziwuli.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7b4358a65---59865268664.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/99756030027.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/33193478079.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/6922352414.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f45bc376---36653408547.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/13019593424.pdfIn PDF document text
    • https://actor-conseil.com/files/file/31068645840.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/poa24tfqio0cr096ro9e44p9l6/xavifipafadesoniwil.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_off0000baa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA1 11288 bytes
SHA-256: 74b2553296fa1acaaf6d2135d0fbaa2604cfefc4c09b96355d6def0d3c28067f
font_01_sfnt_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 17692 bytes
SHA-256: 3692ccaae64f434d84dbd1c0219c5c32de0a226e9c67596bcd026c902bb5bff2
font_02_sfnt_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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