Malicious PDF — malware analysis report

Static analysis result for SHA-256 0971e1105987e555…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 00:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f27a0ba62f4d6d5ec39f02b46d14a65b SHA-1: 13b226e16de09918f084fa894ae329d5ec80d6b5 SHA-256: 0971e1105987e55560397bf464e2ef8b37895d14c158ce6c38116d54d8a60045
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URI links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=general+knowledge+questions+with+answers+in+tamil+pdf PDF link annotation
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145fb2845a76---52260368501.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cc3cc0f6a---33118381591.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/donawalege.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/zonasobibokojaxora.pdfIn PDF document text
    • https://jagominum.com/contents/files/bezuzogasivukax.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/8900156046.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/53235892711.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/posuvagelekes.pdfIn PDF document text
    • http://jfe.hk/userfiles/88818129292.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/mevosotinabapivi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u532m0cph9bpdn10roj5dn2stb/74014527765.pdfIn PDF document text
    • http://kustari.net/userfiles/file/xinof.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/bapusefuzatuwoleg.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146df217d2b1---92957458209.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/pru041eke0e39ol051sb33v60p/nixagidu.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vodavinanufipovedosowul.pdfIn PDF document text
    • https://suksesunited.com/contents/files/2941127315.pdfIn PDF document text
    • https://codecs.ro/images/file/55453780771.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/15184166857.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/mazuk.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b96ae7deb6bc5fabbee6a3abd34e72ad/75061174092.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/3741063373.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_off0000c0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A8 21944 bytes
SHA-256: 562644c876d187e29a3fbeb1ec064b58e926a6c927a9d0074af7e1ffbb365657
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 11408 bytes
SHA-256: ba3009c7226c05a8777048f3cc7e626b1eaf65fedae687257652cd6f04708438
font_02_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1