Malicious PDF — malware analysis report

Static analysis result for SHA-256 8800f3475ef0e359…

MALICIOUS

PDF

73.3 KB Created: 2021-09-20 08:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a615a383f3eba29453fb25c2300d5c4a SHA-1: 26b165c22a03247fece0571755226fc2b751681e SHA-256: 8800f3475ef0e35932db52ac1e453d0cb18800ce430ff65a3dbcf36384b830fb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://eravukappalpalli.com/userfiles/file/soderoxodamaninakutir.pdf In PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/fumagofowemeji.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/pagojololarazax.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/6407455356.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/87750023381.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/xabewedarepetizanobenuda.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145938651cd4---jamutuludaxujexawixup.pdfIn PDF document text
    • https://promise-land.com/upload/file/koxilolenilupepuzader.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7d0cc05ed4fc7af6d6550c6f3f534684/vaxet.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kivule.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/nonoranavobezowugoxavar.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/zewakomavevozezixaxeb.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/fereduz.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/62193877393.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/31984944707.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/58363209946.pdfIn PDF document text
    • https://stormester.no/files/file/finesogewefutexevagej.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210919_77DDEA0DAC5A1FDB.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/vedoxena.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/jafatabozenixikiz.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/76e97666386512913a4f98e95ba82050/74570529887.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/rotuxekesijovamafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=porn+on+my+firestickPDF link annotation
    • 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_off0000bca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA8 16828 bytes
SHA-256: 961fecc71b50f40af46c250823f2ce097bdab20dcd4ca4fca411f08dde3dfc67
font_01_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 10496 bytes
SHA-256: 2e576477fb691e4b56980bbb589b4d730d16ef532a9b1f52d0e996710eeff0ba
font_02_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1