Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf5ec25a6ee831c…

MALICIOUS

PDF

87.0 KB Created: 2021-07-24 16:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17ca505bc2a72351614c22c4cd0a5739 SHA-1: 1fe8e2da1a41300539473f88c3d91151cc66b31a SHA-256: ddf5ec25a6ee831c676c3e48888674d119edc233624876b3ec5ae8151425ce66
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on compromised WordPress sites. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1a6aa6e5e---54655333112.pdf In PDF document text
    • http://altinay-law.com/images/file/31066268534.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/hbgicnqfg6d6ft9l3k9n1fu380/mubafonebaf.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/lafopu.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/37888362403.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/je1t4tusos4cs1h0rc0a3j8b43/48350170192.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/59006492080.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f5764251f10df0b40926be82e9488e0a/8662205764.pdfIn PDF document text
    • https://unosms.us/userfiles/file/lutuwajazobusat.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718501fd7e---46357755116.pdfIn PDF document text
    • http://getvisa.ru/images/File/sujironegaxeroxuga.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fc642eb9111cfe06a3bad3c75389197a/bujabagidaganemifi.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/2993938874.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/vasuse.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5f29p9tl94qgmo7hab08s008p1/20512234328.pdfIn PDF document text
    • https://giustofiori.it/file/9182223276.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/pibagupexizimovanelo.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/iu98go3vo868qsevr6on0o4qb4/vagazevukebadovogafek.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b19fbd03d---muroxaranijavubuzotopesiw.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d62ea76b---jupetatenu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afe24d60264---85282083748.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/basukitubukulapolivura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+write+a+mutual+agreement+contractPDF 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_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 16380 bytes
SHA-256: 300b78773cfe9cc23e281ff8a75ef70353447c2dfa5cb4984a91f7a1be258f7e
font_01_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 10584 bytes
SHA-256: 0b800e8f40585d7b716162beac401be04108efc8370219f694939b764178e583
font_02_sfnt_off000135f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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