Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edc8d43bec37ef7…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 05:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a106270b88c8937c4ed7733fd5c4120 SHA-1: 0b8e45ec632e2f837f24204b7c3501b42f551bd5 SHA-256: 7edc8d43bec37ef75be87279c14c86b52e3a9ff7755d20ae29e2870d22fd67f6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample, but the presence of numerous suspicious URLs indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://huntic.ru/uplcv?utm_term=gurtin+continuum+mechanics+pdf PDF link annotation
    • http://omonetach.pl/foto/ilustracje/file/1872197543.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/pobogupeluriradedevesiz.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d06a8eafdd8565735ebd7049972b28e4/lenimirixusosomitibij.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/tebajidu.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/97194860615.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/68359264772.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e8c2301ec5b478df7c16bbcbf2c1a956/masixolalaxamupi.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/tagurusinerupiwapo.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/58e8fffdbe672d4c25379bdceeb9e384/tirerono.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/fd3a797d76d48c53a715339b4cb58eb6/paliwesewawelumi.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/9459116275.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/6442f27d12161f09fa885432d2354893/zeganatu.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021071600432670554.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/894af361afa0aa8d31760db1af1a9874/vijiripoj.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/73093120822.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62f6cbdd2---15159360044.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117064612737---70546363588.pdfIn PDF document text
    • http://willbramephotography.com/dogitutanowag.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b582a626689---nawewi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/m5603osvcqdk2b059mg8ls1mt7/20587969819.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/linikewopuje.pdfIn PDF document text
    • http://airsoft1.ro/files/file/raxudameg.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29cbf77585---91189991388.pdfIn PDF document text
    • https://go2germany.ru/files/file/nusiratewejuravanogapaxi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hnebgfdkp2pjfjmdqkas2g7sl2/57380192707.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3cab7b437---pesuluvuxexesipexi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9u0ekvd7mu2v6a1v71to11kbp5/89889586485.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_off0000c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48A 16440 bytes
SHA-256: fa1600da001df740ed78a469b3306004c236b34afc64b8a955dbf03896401569
font_01_sfnt_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 10980 bytes
SHA-256: f3b4e7805bb9ed68b695b3e3256df5c63591e4f826eada5092ee377228f939b3

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