Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a34a39cb2b6239c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-04 06:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e07dabacf9e4551354eeffe851084dc2 SHA-1: 7790b31da7ddfe672071130a71207fe6946ac063 SHA-256: 9a34a39cb2b6239cbd5b568799cf1b732fc59bbe8b19822d3078f63fa6ee8a8e
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://etonbio.com/newsLetters/images/file/dusasuwokosuzuzuletasev.pdf In PDF document text
    • https://service-panev.com/userfiles/24153240454.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ecm3ab5k23f431hv78ap0kghek/lebanogor.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/43183383917.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb755b1b508---39389754774.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c077c210ee8---24390422859.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/q81bb00il5p82delv192m52882/15861252634.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/23729462535.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712a7cf138b---bofolusabafudunibopof.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/zuvawuwisukipetexoko.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/28444479236.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/bowuworerudumeb.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b154a3e62f---50198415027.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/88322945926.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/mipozasopapazifel.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160792b66ec448---7653661127.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e342302ed470e79c3de7915e5630c901/maxelemolekuv.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/be0d1fda9fc793cf206daa6252f9f40f/35494371833.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/xexigumatib.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff209e8cb---16211220819.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/vulewuvuvegufijogom.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/53331669090.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9bf88512f---42296873992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=2015+vw+jetta+tsi+manualPDF 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_off0000b4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCE 15200 bytes
SHA-256: 987d7145da1311d7bfec28cb3c16ca24fc8e02d68ed65a78d5a9eea2d70c31fe
font_02_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 10764 bytes
SHA-256: 70d7e6f1c878744473fed4faea4c768f39ae45c67b7a92dab33695336948aaf1