Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa6930a081e758f…

MALICIOUS

PDF

75.3 KB Created: 2021-09-11 20:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7fc9af5efcbf1777de3cf7f2edc920af SHA-1: 4dacb45f17736c091f96be323b25b768f26528b0 SHA-256: faa6930a081e758ff195804f87349e93f541b471e1962f67059b5b21ccfb272a
104 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple external URLs, several of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the presence of a download button lure suggests an attempt to trick the user into downloading a payload. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://europartner2.pl/uploads/20065187946.pdf In PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/sefazanasufonuliwi.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/nusugalelaxedejo.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/lafilelurupivuzewubor.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210904054821.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/59285a23c6921cf7db3ac1604d39875a/laloje.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613430b619f59---bejofijanajitufukafigofuv.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/sefivebosum.pdfIn PDF document text
    • https://lecachet.fr/docs/files/xubekitizofamexofi.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/xesuruxosalomuvefowew.pdfIn PDF document text
    • https://faceless.me/userfiles/files/fasofifavina.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/77942773776.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/10766964460.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/kebudopudurebitujoja.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/59653531601.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132d236ad42a---26496366604.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/ganewugomituteturun.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/wenef.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/daduv.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/57560906530.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/16771322309.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/47094411430.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/64746232842.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/pufakerovepotel.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/sezeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+android+cleaner+2020PDF 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_off0000c333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC333 17068 bytes
SHA-256: 7b1093a1ef7e94e2f8221b89edc0b6e0ad75e050a252e21bd020b917cae785d0
font_01_sfnt_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 10660 bytes
SHA-256: 23f715f7007a736ed0ab84339a5a2881dc0422be84074ed5a14d587da17cc0f2
font_02_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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