Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3a1b41917895b2…

MALICIOUS

PDF

126.9 KB Created: 2021-06-25 17:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c640e53858ea54b1041b939a6c93ad8 SHA-1: 0d5aa28b9f0ac6a93d424b70251f8b1cbc2d02f8 SHA-256: ee3a1b41917895b2b69778adda569d8782d684d32ff7d73352f288735c06b3fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it functions as a link farm, potentially leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://kirakuramenandsushi.com/uploads/files/wefuno.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba47f3989b---gaxixoweritapomideg.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/hnodvon5jo8bodtj2d4u81s8h5/dedes.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/62411851781.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bcdb790be0bc3684e4e11e3616e12608/76621330776.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/gakokuxebe.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78096c4f70---66842662569.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/c405p4of9c02jvekafhcgifgc2/ligiv.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a99efa2c77a---gizuxedejufop.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c31678700d3---namilejades.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tidezesokilazoz.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc74426c5f52035215e6bb67fce607c7/xifamuwevefimoxa.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/aeb568dac472f4d5d8ebdba536fb34f1/dafun.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/50960337566.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/l324psn90m9qh1ojk5l264ikv6/tojuwosobazaf.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/hpjtsoej28njb811vl7eu3rhca/tenatizasejet.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608214f6b88fb---91973025149.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/63152587315.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec076691f3---girefekepiwofafiwowox.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/91188448775.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c25f9f101---kawijazezubufatazaxep.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48515d801---75184765926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cue+cards+for+ielts+speaking+with+answersPDF 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_off00018dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DD8 11208 bytes
SHA-256: f0c08a8b1dfbf91497e930019b8ec2a44ca96f1b4574f1325ec583552ae583a4
font_01_sfnt_off0001a7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFF4 16984 bytes
SHA-256: 23cf03aabd6b4446bf21be85f506b4c1a7d0f1975115e091fda617b8994950ad

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