Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfde4f02ea4835b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 05:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6548a3b1ec24bd2f287a5920122df0bc SHA-1: 49d9c897005aceb55e0e0fd81f8d302b577fa7c6 SHA-256: bcfde4f02ea4835b0c18b3bbb51fa6acb068c6cdd023e76102827577cd1f585c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting its primary purpose is to host these malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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://cambodiaangkorhomestay.com/userfiles/file/fixamumunuke.pdf In PDF document text
    • https://agrimal.pl/userfiles/file/mobobefakamu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077ecf20fe39---nuwedogawewenukizidej.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/19319447143.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/63924884227.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/velerijexun.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jgmsa6odsabtpt80l07iv9q4c6/34582751005.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/62125271532.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0243f012c0---rujugawolikibijo.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde5d944cfa---wajasovoxowapewipamol.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kupopamumubitaj.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/fdn5hqqd7qg9tmimaf0pvvh8g6/69164762353.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/bc5fe26d2d8bf52352c1df072fd6142d/xajudodupido.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/93490502194.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/mulivonosofopel.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e94500fc70db243a56db253f2a2f5b86/dojane.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/98405903850.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/19290672524.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/remukizet.pdfIn PDF document text
    • https://alohasafaris.com/files/19951740801.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcada5a66d---zalikakuwusox.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/48pilri5llv4o7t9beduf9pls3/25530906229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=convert+20+mm+to+inchesPDF 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_off0000d2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BA 10628 bytes
SHA-256: 9f69de3f68e19f0ac19b55aec91ea1fd02df3a3f5d02329cf2bf9a02b7c84b5b
font_01_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 17520 bytes
SHA-256: 0b4d497541ba69002b19a7dc6cef047ef464e246ac120dfd8646af04bf71ccdf
font_02_sfnt_off00011802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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