Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7d1dd564983f38…

MALICIOUS

PDF

74.5 KB Created: 2021-09-20 09:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b89cb39ce1dcdcba31a3abd99d751a03 SHA-1: 32878ea9a761da92ca389946dd58c0d405453215 SHA-256: ad7d1dd564983f38631938e6158ee9eccd95afc481a728e03c4bc8bc1559d40e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to various domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The presence of compromised CMS upload links further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=tango+mod+vip+apk PDF link annotation
    • http://esteticka-stomatologie.cz/files/content/file/69809115884.pdfIn PDF document text
    • https://bagstyle.uz/images/file/21687059263.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/2bb8048a393bdc40b3bc23b6fb64dd79/70063345501.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/55019634537.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64910b5941119ac7933cefa08770141a/popizizibojunumu.pdfIn PDF document text
    • http://xn--12cf1djdb6cbcafdbu1f1cudgcc8am4wf7htgd9de.com/ckfinder/images/files/98801436709.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/55401723605.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2439240dd---42663742832.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/21819392836.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/36690970657.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/60611502209.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/47267275954.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/boposunosabapot.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/fojupawutenolixa.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145cdd5b4c05---88295717823.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161414289a21fe---vatarodo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/buwojivekema.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/kuwug.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/18208030787.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210908034614.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/welolatofuj.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210918_042604.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/bexokutexezevimuwuwige.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/dowevomidegizobabuvefeve.pdfIn PDF document text
    • 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_off0000c06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06F 17408 bytes
SHA-256: 5168640c0471b045661f4762676d75d9332fee8a5b6adff2df1e78898f2f4528
font_01_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 10312 bytes
SHA-256: c69e4d91a9f3d605eb41bbf785aea9d738c08fdf76de897cf46bf61ea0af0449
font_02_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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