Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b0a9813a70f64e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-23 23:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e4cbf389a76cac6d48920bad4b2de39 SHA-1: c38b671c6e7f9803fdf685306d1a93d81eaf2579 SHA-256: 02b0a9813a70f64ec2f9ebd1bff24adf160f655898acac05bca9c6fa10e26772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=redmi+note+9s+pakistan+price PDF link annotation
    • http://somsit.com/ckfinder/userfiles/files/16663735837.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/59864221489.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/16946134052.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/61118601083.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/pidemizot.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1d3573e6---74654950812.pdfIn PDF document text
    • http://huiking.cn/uploads/file/211804298512.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210909082707.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/limaf.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021941822133551.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/25795719686.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/8759398981.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/defefo.pdfIn PDF document text
    • http://poliinc.com/upload/files/wedowexifebaku.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///19240928364.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161459eff60e9e---88689228499.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/gudipuwati.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fc3357ebe---41005810391.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383745e97a4---kizudoselanex.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/36187274271.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afe8302853---47188875163.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/debuzoxopo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613997d810e5f---91219508104.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zirowulaxujejenekovo.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/bazegixojawejategapakabas.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_off0000d06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 10932 bytes
SHA-256: 2ae32f3d5e6db1a896ec89b674db51ee64c2eb520ece089bdb39b832d0d4d012
font_02_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 18448 bytes
SHA-256: 44147e6d304cffea7912b75e07c6d5494fd9e5d74c1cedaf7cf127b172e9f1c7

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