Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3533bc924ffa17…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 11:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4af88f107a225c82bf14b56b4b75d78a SHA-1: b1e9a668c1bf8986dad460afe1abec7af1665c47 SHA-256: 6b3533bc924ffa173bdf7fce5fe54601af8addab5f6fc7780b43d4bebe4efcd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=best+audio+quran+app PDF link annotation
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/mupabasuzafataletosu.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/sagixifegunebo.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/19621295080.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c16071b19045fc91c2cad20597101794/88052496886.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/sitefonomuvimawojotimo.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/2361595331.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/56ad529ce2f54828be03f1b905a84cd0/68853791734.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/xenutovokumudulabika.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/napogabunilamevozajofuzaz.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/suboposaxosagirabulodowu.pdfIn PDF document text
    • http://jucal.es/images/file/76249227875.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/soxul.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0b45078d---papapufomibezi.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/ridivobewepenofo.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/sipam.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146ef46c56e4---56365625942.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/17580602131.pdfIn PDF document text
    • http://slsnn.ru/content/file/64431416222.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109140347504764.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/16985064715.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/mokomuxapozobuwolum.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/ligepasaludupomufu.pdfIn PDF document text
    • http://infunplastic.com/d/files/14024655240.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906124557217108.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_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 19320 bytes
SHA-256: 161674786f7126dd9b35b1cffc3e0d6159d4329c037b09c6fade2ef7047c654f
font_01_sfnt_off000120ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CA 10636 bytes
SHA-256: 4db110b387c45d119312f18ee013f1fb8d1ed0bb5d58ceb34a273b157a34f792
font_02_sfnt_off0001390f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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