Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0a7a0e7b3283cd…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 02:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1cf7fbd621f4dbd1520ed554729a7e81 SHA-1: 8616cfe72b223c327e29be29bad966adc8d96c0f SHA-256: 8f0a7a0e7b3283cdf6a6de4c5176683fedfef55f07d642d311ce4ccc96268d45
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, further supporting the idea that the primary function is to host links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ilovehikari.com/uploads/files/wuximuz.pdf In PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/fdbb463fe807af2960e2d3dfa5d2634e/bilifopiwusonodagij.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f1721af23---rukimaf.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wuxiguwiv.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/ximejon.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/769f301e47a5c551a98b9e5b79ca8457/semapotikituzozi.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202108291054579752.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f69bdf2b123---sitikajojug.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a687f45b726---bitajajinebibokanu.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/87738792414.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/30956304822.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wesiwe.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1176d43e---76490326044.pdfIn PDF document text
    • https://siroyensao.com/upload/files/95812698212.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/81001381852.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/22188473469.pdfIn PDF document text
    • https://actor-conseil.com/files/file/63491283397.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b9678494c12bdde06cc4bde22eb6138f/xorifilezatatulux.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8ff1900d---kojizaxekojoxaxujobilefiz.pdfIn PDF document text
    • https://aashianarealty.com/file/jebub.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/sakifisobubofotadaturix.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/80939747365.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/9472311474.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/56970833739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cadsofttools+pdf+to+dwgPDF 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_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 10360 bytes
SHA-256: 62749f46c40d569c7ab83b36c404493f05080ae125edea7675c0a05c692497d5
font_01_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 19120 bytes
SHA-256: 1637d87869cab0837d8ff895d630a36f7e4bd789a18290c378f63d50c8afac4d
font_02_sfnt_off00012789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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