Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78e19dcd8c63060…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 06:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1c0d989da177da663f1dd999243d706 SHA-1: b65f704b00ecc73d44d3e21fda8bb65bce220421 SHA-256: e78e19dcd8c63060a4ecb085b4009c78a515bdb2357e70db8d8b30bea630d9f8
172 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external links, some pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of a visual download button further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=singham+punjabi+movie+download+480p PDF link annotation
    • https://worldpigment.com/image/upload/File/62557475232.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/keraka.pdfIn PDF document text
    • http://visoda.lt/ckfinder/userfiles/files/sipudowatoxejiwa.pdfIn PDF document text
    • http://indemo.pl/Image/files/natujutelamebanesipuzif.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/91742228066.pdfIn PDF document text
    • https://krossi.ru/images/content/files/4527259163.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/27410742514.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/80717429538.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/29681907812.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/liwumusutupuxaz.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/lomakogo.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/96744933088.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/eqv38vren4jg1hv4764pinrmsb/dojak.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9278258f2947c6dbf90d7a1393f00d61/72672840068.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/60052976566.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/zedutepiwolijazufoxegema.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/nubelu.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/sawawojuw.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/56760220499.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/29626574463.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/lijuvuraxugunomuxek.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1614190e81ba14---vudav.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/24140996644.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/55081776533.pdfIn PDF document text
    • https://aksusu.com/upload/files/guzazesudaroka.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/24372436780.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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 17256 bytes
SHA-256: 7edd18aa589f8170a6ea05d14e687ad2088b9f3162f833e817deb5c0bce6cb22
font_01_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 11480 bytes
SHA-256: 60c3b80ce9cedb5818dce1603abd46291da08c68da46b0a776600eee03d94c51