Malicious PDF — malware analysis report

Static analysis result for SHA-256 86770445b26ca3d2…

MALICIOUS

PDF

75.7 KB Created: 2021-10-03 15:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d925eaf07124eb5e5282d5eb5f14800a SHA-1: d10bf8080d617ca16dc28900c73950ebc1e28f96 SHA-256: 86770445b26ca3d2e570b89acbdadf287f4a208a14f63db487b0272ea7c82ac9
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PRC/3D content and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://seeandhearbetter.ie/img/shop/contents/40186224968.pdf In PDF document text
    • http://studiorestagno.eu/userfiles/files/39587982.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ccf7b4397---71605603753.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/28266457810.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/xoniv.pdfIn PDF document text
    • https://lecachet.fr/docs/files/fetonobe.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613937a4767b6---pibowas.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ptu4sdmqc6ps362lihpo1vhuf5/99181409288.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/47857768132.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/denezixaziso.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/54923637956.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/jovuwadikogifew.pdfIn PDF document text
    • http://metabolit.ru/files/file/79645969181.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/xazoga.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/40674080096.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16144317033798---vilafikexubugowuwiwa.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210927_020454.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/zuzulelijofa.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/bumakesebunesenaduzifimax.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/ratajakoveroloxulanu.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/jegegevilixukepedukid.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/56871399819.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/fiwodedovunam.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/ruxufifogatut.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16158b9e8e2402---38065919268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wormwood+for+feverPDF 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_off0000bee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE0 19860 bytes
SHA-256: 970dcb839d96b1f8b0b6ec94740318dfa72a89a04934c320fc03ced40a88c600
font_01_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 9988 bytes
SHA-256: 8a727650094ad6866c9e8392c0a5e32156a2a2ab22b621691decb2d07d462317