Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1174af5369e51fe…

MALICIOUS

PDF

75.0 KB Created: 2021-09-27 03:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3d59bc74dbfb15d362c327aba6aded3b SHA-1: d35c3505d847cb9bf8950e0897fb9a728ef037d1 SHA-256: a1174af5369e51fecbe00dcfa50dbdffe3437366c765a34b433fca7b4cf18e94
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI heuristics point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=the+kite+runner+book+download PDF link annotation
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/8129526784.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/73946237973.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/44248562069.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/gatonebolipuj.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/kowizuxabakadupepup.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/48161352217.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/wuxeforejek.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16150fc63e0f1c---worut.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/78539254584.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/34491542384.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/48955053852.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/22480206840.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/18208379876.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/gabavirimizagopafudulog.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/nukuzi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16150238608e39---perasazuvebiwudukux.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/gikijonidowa.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1d4ffa70ad3fd0f714262d83f359fb6b/mexadarenufulafu.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/kojivukigozabusowumufomep.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf5d11b0b---vepowupuvexotovoxudu.pdfPDF link annotation
    • https://www.bosingels.nl/ckfinder/userfiles/files/36741390094.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/wazogenofet.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/87214898047.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/77874015742.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_off0000bcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 10556 bytes
SHA-256: 0dc79c85c38f55dd3ebd1a63aab9d45cb9dfabd49cb95c9d8734797aad18b46d
font_02_sfnt_off0000ece3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 19472 bytes
SHA-256: 45332f9ac7d464b2e2b3c6549828994c239dd40077488cc231a75d49f3c6f001