Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8941059872f798…

MALICIOUS

PDF

68.8 KB Created: 2021-09-22 16:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52b2a9d1afcca0840da9c0e082d702fc SHA-1: e0e3c3cae89e05d5fa7895f013b380ecaa22503a SHA-256: da8941059872f798250e407e4cfebe44dd4ba9edfa13a84531a84c665a10c823
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common screenshot lure technique, presenting an image that likely conceals a clickable link. This PDF contains numerous external URIs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=how+long+can+you+keep+cooked+chicken+at+room+temperature PDF link annotation
    • https://basisangka.com/contents/files/71003291952.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/5766331229.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/modorepuw.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/15354504524.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1a1591c11dae6fc4193264d6bad03532/38636298509.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f3733818476b0ac373820343a104d1fe/nexedekijugodudagogado.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/31100507613.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/jaxazisivexinodulodapipi.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/gamal.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/90015396391.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/60581223936.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/94369203693.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/pizijijuduvisixuko.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/guxenegigakupig.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/96236909082.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210911212923_3i1gbz.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/gelatuvipiburikenije.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/8gc9tdgv4g0hhmldgik7a0pn0p/sojonidiruwarodosejemi.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/98724795628.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab3670eee6---xogolotibejiwoxotunarum.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/83355191373.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/kuwob.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/kawijosemubawovarijusim.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/20194814245.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/5021765849.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_off0000b0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DB 13892 bytes
SHA-256: 9479072ce2b2e80dcbdb301d373970db5221f20b96f5660681beb91bc46dc650
font_01_sfnt_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 11176 bytes
SHA-256: 095fb99ab27eb4a960a849bd0c3b058fa6feed7a12545c1c1ba53249a722a802
font_02_sfnt_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1