Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bea2c4ca24aca72…

MALICIOUS

PDF

82.1 KB Created: 2021-08-10 22:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3fcb9a50e9a253df3934e315e2be66c2 SHA-1: 5ffe350a5fa78d72fef333f87998576da6c5aa63 SHA-256: 2bea2c4ca24aca720ff9ffadbb32cafeddbaff975dc97424b0764e67c4aecf1c
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of threat. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The presence of numerous external URIs and link farm indicators suggests an attempt to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/r1ccmqqia3enl7l16mof08hfmj/99713109196.pdf In PDF document text
    • https://appvid.eus/userfiles/files/nuvipupib.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/36280240409.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/73885862409.pdfIn PDF document text
    • http://snsi.jp/image/news_file/turizoradanona.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8bktll1kef1qcqk3g2qmrmm2ki/dojawuwadatatow.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7013186726135f4667e43a44ed46edc7/tubixenomereribaragada.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/1380602598.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/e455e5124106747883d7c3d9973f1776/wevapez.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/runikimomijexo.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/39696391405.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740c781b412---jekinuwotunezokilijokip.pdfIn PDF document text
    • http://altinay-law.com/images/file/gusepitomeputexuxegal.pdfIn PDF document text
    • http://netflor.pl/upload/File/62163849833.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/juzamopefi.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/1299862402.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/37863885332.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/32410139456.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f24cbdb0921---jevinava.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/cjmvjbj170k4476a8rf0hel155/75744357554.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a181941b56f---39343288156.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/18821424919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=un+viaje+a+las+estrellas+lester+vaughan+resumenPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 10736 bytes
SHA-256: 5c2a95c1c139be14b2c4f61dd4926a6bfff0f600de09bb7f46c5c135b00fac1b
font_01_sfnt_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 17840 bytes
SHA-256: 5f172b9f14bc183c10f35e3a5c092cffdf8cad492db8596706d327bd759256f9

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