Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3160b305abcaee…

MALICIOUS

PDF

89.3 KB Created: 2021-09-04 05:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4278a127481a72326ca4f4fea79510a4 SHA-1: 6d9af67a647abe8916ec5dadd48a51db83bc2311 SHA-256: 3e3160b305abcaee3cbba490427d73abf460face47e3efed6b92c2830ba14a95
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, pointing to numerous unknown URLs. The primary attack pattern involves directing users to these potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8494ba55d491bf310c8279d9284b1fe1/mepilabodu.pdf In PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/o245qno1n26tg3evtbgahno3db/48498279733.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/737c4aa0f66d02750b106a3e22ac4a1d/metativul.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ceada4a7d1de829726fcb284a4083c5a/10401030668.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/naroxiwapebufetupudevu.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9c7b5t3ofvr7dr44k56n194kp1/fuwiwejozopunu.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/26853283786.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb027e0701---81159666710.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1ffd4606---fukeduzelubofi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fb130b224---69955735496.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/mibokopababejejokarilis.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/bezujibifuvegiseb.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/45955011155.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae3d9b8e6---pegokerebavexefiduzetuv.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/88686820365.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d96022d90e0---19714577918.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/matepejo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cd7ae7220---22232941970.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f01ed1633e4ca905f2d71b85f2e8fc85/74859813741.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/jajegorewosokuliriw.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e02f1b520---mipajebuvusi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/05b299662b22ec61c76b52dd96e30e10/69005059233.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/57651063177.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/xovomotatepobexidatifezis.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/pokegulukedetatoxorufegeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=libro+el+animal+moribundo+pdfPDF 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_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 18480 bytes
SHA-256: 748e7d5294fe4d987c4e0a049693f5c7ba69d4120a95db7c1ebdc33320636a57
font_01_sfnt_off00012917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 10592 bytes
SHA-256: 02fb70fcc581741b9297c45932e5cd965d39c63605be11d04f156757131ff1a9
font_02_sfnt_off000140e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1