Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ff5e9208ba70a1…

MALICIOUS

PDF

74.4 KB Created: 2021-09-13 16:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b767a89ab63d1197f23c76e5fbdf396c SHA-1: f91d9fcb859b2b165f17858ca6402cb57c58496e SHA-256: 41ff5e9208ba70a1e1026989c93efee53521ea88911da1fa6d3467616ac9f6db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure itself are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=how+to+watch+naruto+shippuden+dub PDF link annotation
    • http://cy2hand.com/userfiles/goduzuwevuxef.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/nifasisijefiduvavilofo.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/najuvigufagikuserupir.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/kokawefav.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/41844435162.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/naxizuxobuduwi.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/55479823118.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613785ea5d8de---64556036910.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/2356929013.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/29224733071.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/nuzuwuxukusifidu.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/nuloviwudurevepigokam.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d296bf0141---95647789059.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/82677773497.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210912_CFD2FFB6170F61A5.pdfIn PDF document text
    • https://network-italia.it/file/48493148408.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210904_9C6187BDFD888692.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/rovopitovobigifosutat.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/posadox.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77056787809.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/22748771999.pdfIn PDF document text
    • http://peoplefoster.com/pliki/wonaki.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135050224b8d---2480549014.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/livigosejatebopimusa.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/tikulu.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_off0000be72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 17232 bytes
SHA-256: 796bce5b0a48819e8b968fad4368f73abb64a54646c3b931599aa34144504818
font_02_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 10884 bytes
SHA-256: 83fe17f4f9b2bff463b8b67388c21f787c4ce2cb690f8e8923719395c83a33dc

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