Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f13050505a082ef…

MALICIOUS

PDF

100.4 KB Created: 2021-08-19 03:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 103e6cb2333d685a3688fe5b59f06a1b SHA-1: 48b17282794fd4fe174eecaeebe8979f7e0d62ac SHA-256: 2f13050505a082ef924a510927c59df989bd5c534c4d012ae8967905aeafa360
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://southwestlooms.com/admin/userfiles/files/daromejisogigun.pdf In PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/8340470299.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/9e33188ce73ff3d1ca202bd2b12083a7/55780515707.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/7f796gq6dl8eet8ttj24pm8eli/barup.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/25c457149419dc33bfa141f20e759178/42248900582.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/90270697688.pdfIn PDF document text
    • http://rld-carbon.ru/file/12429364923.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210706162557693359.pdfIn PDF document text
    • http://195exim.com/datas/files/badakiraxireg.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/podagumanizeborixafoxesis.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb880d9675---vaxiwegoxuvad.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/73628419622.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/269baa3ac07fb95f3b05b8360713f4bc/41408349460.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/guvolobikelupaludimi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/cnhgjjj6fi3ir106s9binn369n/11194091994.pdfIn PDF document text
    • http://hodori247.com/uploads/files/ruwepumotepulepan.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e6b405b2f---lotitodexo.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/renabubifanujosoxarixirun.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/finubogine.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/69472296863.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/352029524501625528054.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/josavunexoxujutepilupedox.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/55380986231.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/606cf4f4e93b0fbf2968628dfed6b4c0/defobatow.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/3402838920.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7450a1290---45777998060.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kofalipaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=you+crush+mod+apk+unlimited+moneyPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0001508e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1508E 26800 bytes
SHA-256: ad4a31f52d49438ae994ca9640d77657415aba73f4b2340be8ce3d7cbcc0cfd9
font_00_sfnt_off0000e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 17876 bytes
SHA-256: 02e768c14899a5e7c5865a7c499427ed59845a3437de3cfb19e0a6c9dcb40ac2
font_01_sfnt_off000116d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_02_sfnt_off00011edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000136f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 11068 bytes
SHA-256: 626e9ff3dafbeca768e66526dc1c38a6cdacd449baef29df0d1952e82e750563

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