Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecc1f1a46476bb1…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 15:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f3613dc09b6248ac8365fca415296e1 SHA-1: 547636abf1af2800b9eeeb22ad1434c84229b8c6 SHA-256: cecc1f1a46476bb1db55c63321367d42b240ccb3b3968ffd9defc25dadf48ec1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites hosted on potentially compromised CMS platforms or disposable domains. The primary goal appears to be SEO manipulation or directing users to phishing sites, as evidenced by the numerous URLs and the 'utm_term' parameter suggesting keyword targeting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://clove7.com/userfiles/file/posizonu.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa5a36aa66f2c070f69f8b5c1cf58121/60347776672.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/10e8a2a7fc51fa4891c255d9a93bf975/gurubufelajopaxa.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b5c646ca6---79182914126.pdf
    • http://ecohort.com/userfiles/files/bekuzizenemakerojabem.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ade3e21dd7f894f42605eea866f43f15/74432180947.pdf
    • http://dok-vo.ru/userfiles/file/dokufegubiret.pdf
    • https://bhavanarayanaswamy.org/userfiles/file/rujerolazepoxonituturotak.pdf
    • https://muratay.nl/userfiles/file/xiwigezu.pdf
    • http://shesob.com/file/files/pazagovamowosamax.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4863676d4f538e91cfa7fef6dd2460d5/18499931193.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e673e8e521---28615631124.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5f3ab7a739b50cf678fc2b5249c90257/sugekusi.pdf
    • http://lycee-elm.org/userfiles/file/detitix.pdf
    • https://somos.co/dleyes/admin/fotos/file/31116536497.pdf
    • http://findmecakes.com/userfiles/files/42706025228.pdf
    • https://mfdesign.hu/files/file/jibovaximofubogomazov.pdf
    • http://tks-forever.com/upload/2021/08/18/file/89986283676.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8f890d6a9---muzalukesekawi.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160720211f2f9e---50117770478.pdf
    • http://mgtofubbq.com/uploads/files/73758657476.pdf
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/93735581833.pdf
    • http://eko-uklid.com/files/file/zejokiw.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b15e07704---8704242864.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hcl+technical+support+interview+questions+and+answers+for+freshers+pdf
    • 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_off0000b233.bin
a4ce1e7d16bb2bdf93f2a60a35519622d85e9b4ab665d6274330c43479ba13b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB233 16324 bytes
font_01_sfnt_off0000da27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 16792 bytes
font_02_sfnt_off0000f23e.bin
9b9cf75967191d819ea8f412246af01d35017390f013f3486550441cdaf2c049
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 11104 bytes