Malicious PDF — malware analysis report

Static analysis result for SHA-256 2622ed17db59b47b…

MALICIOUS

PDF

85.8 KB Created: 2021-07-07 12:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfa278fbc7b48f7717110e0c7aabea7a SHA-1: 0f6ec0756e1d25d475baf50ab969395efda9b6fe SHA-256: 2622ed17db59b47b757f9f48554b1af9c39b259a63a320c3462bee059e661651
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple websites, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ab1b864c---25308833391.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210623215659.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/0jupqvpl3u2fq101jbo5cjq0uo/gotevenomizarikoxuko.pdf
    • http://18554080.com/userfiles/file/musoza.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/913ab33158b86c0e6347be9c66324e45/67834849930.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160827c8006b2a---beruzewetizefa.pdf
    • http://goldmustang.com/files/files/68070285511.pdf
    • https://aashianarealty.com/file/levidupapim.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a88a1ddb4c---22280665602.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ad861fef26fca83fc91e7715be58d00e/selijunegupawiwivudivi.pdf
    • http://brava-ekb.ru/userfiles/file/48698665966.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/addvbfd1q02v9jej017k649vjp/xiwiwawuze.pdf
    • http://grandinhr.eu/images/user/file/jizawusamatowoxunuboda.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b96cc9b81b3---60370550136.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4038f16d2---45023619574.pdf
    • http://wawa757.com/uploads/files/32544142555.pdf
    • http://esrafisek.com/images_upload/files/11135734463.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/261632348327f04626d22cba67ce9001/bosifopaxagax.pdf
    • https://snqrsl.quebec/upload/editor/file/72458076693.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/b21be45748e8f00d6f93741e87d2efa8/mafuwidosuvaronoren.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb51d7eaf4---72628625258.pdf
    • http://altinay-law.com/images/file/64231656540.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/gjb76qq120rasjkr55mr7ma1gq/40193917910.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ead8f13a8---643923133.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/37798122059.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e67c4f316---lefiraledaje.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=angle+bisector+in+math
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 16792 bytes
font_01_sfnt_off0000fee3.bin
5d0190bd12a2f4b5ee75016c4b794b032a96d0aadc13f727a21b79c6b6260d6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 10796 bytes
font_02_sfnt_off0001179a.bin
bf086d8793f06fe821716a4192ac04fdf102fc5da75e1460337990d023be383c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 18600 bytes