Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e49506f37f3d06…

MALICIOUS

PDF

87.6 KB Created: 2021-06-28 07:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3794f08e87682c1d82347bf82448b80d SHA-1: 36fd7882f666bd09a836736bbd9802af82558003 SHA-256: b3e49506f37f3d06235527539a0a554f4e65b6c7867587db0deb0836b2e08b3e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The primary attack pattern observed is the use of a link farm to direct users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5a9b3ebea66c20046ca3cc82f3dd9328/46503327952.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608817bd3e3fd---33335858550.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/1f343468c155613184718d4f6336346f/61555104412.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9bce5b558---dorojotowenanibulo.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/30371121962.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736eab19221---didujikarupagevirozedekal.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/17262644501.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/bekabudevuko.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e737e12d---22323503743.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dfc841515---giposexedudo.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6661902a6abacd9935ab8cfd55b43e24/purowokixa.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/90936eac6e6a8d4f9a9ef6cc6ef9d018/xofarodavepesag.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbba901f753---zazasisamulagexowiliwagi.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/13922616890.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/zomebuxukime.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/58953600808.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742c6c097e---geboxotubiledalisekaw.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/gekuzogojomisasipabibir.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/fu0ehmc20ruhoif33g280ku4r5/80786122243.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/o257o9t1bv5kp27g2gjfirv2d2/wapavuwujafuk.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210625184639.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edfa437db9---55832817935.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/pibiroselavu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160709bd47ae6f---86226996250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=precision+and+accuracy+worksheet+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_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 10816 bytes
SHA-256: 9344c5842301367c5946fade5bca08b800b52aadd24962422ba20de05e928b48
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 17792 bytes
SHA-256: 1e5a6e3254b629bdeee84ce806ec9017781b3b61d5f3893636a1a1e1430fad5a
font_02_sfnt_off000138d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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