Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb6a9ffa8df8703…

MALICIOUS

PDF

90.7 KB Created: 2021-09-01 07:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c453d611be30fffc3f45562cb44c58a7 SHA-1: ffc9bd41d45ceb0e24d2946d322774c0159d392d SHA-256: deb6a9ffa8df8703124227d9f904ffd33846fac9d3152800c3d96dec851f51d3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious or phishing content. The presence of numerous external URIs and link farms indicates a phishing or content redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607fc593a8992---51729541695.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e552f0845---pokaf.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16125c1c480441---dosugek.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dcfde0517---tajimoxijawi.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8169299ce960bac73f46294429ed62a6/49871095885.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/jelitujoje.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/19983288299.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/13040042690.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210709220652_sg5anv.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/wudadedefa.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608756710820a---vimujokosakozodexurosano.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/56369217563.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/f58fd10541b080bdcc658a902366da26/saramipilavezuleri.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/2f4bf7000bb759cf85c8bd76156a3065/zaxisojemavizuj.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/wakaxosibujadeziziju.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/39272338487.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/87530304908.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/006ee6ead7cbbfe19404595a4833f16f/xadukiz.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/83356565419.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6a47b40b8---puvurunujapupaluju.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/62616409695.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/bamivuxujogisibufaxeveka.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/71031677598.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/10863695624.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/nafezesoxolenawetirivuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=case+formulation+examplePDF 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_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 10752 bytes
SHA-256: 73e96b2c93290799b9c60f718d99b76cdf75bbd7a66d3a3c796771ff36a6d1da
font_02_sfnt_off00012f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6E 17860 bytes
SHA-256: 92db7d23cb28d82ef3c379d8ab087e383860e2e140e2c6313fecca312ee04ce2