Malicious PDF — malware analysis report

Static analysis result for SHA-256 28945c1e0152bfb1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 22:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b52500ed57554a6495633a3c5f7aac9d SHA-1: 6e9b72331cd9e48d8d86422bc3af7a9ed7f09521 SHA-256: 28945c1e0152bfb1083d80985d47d00ea7f1f9f94a7b811d41a3f783bb3e4333
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for SEO poisoning. The presence of a 'download button' heuristic further supports the lure of downloading a malicious file. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=pokemon+crystal+download+android
    • http://choragwica.pl/userfiles/file/tubozer.pdf
    • https://taxforce.nl/userfiles/files/94733636672.pdf
    • http://kant21.com/userData/board/file/lepobepobowuranomu.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2vj52ngn3emb30ou6aipt3849q/5796122913.pdf
    • http://acudrved.com/ckfinder/userfiles/files/37663408906.pdf
    • http://hanyuchina.com/upload/files/48227091421.pdf
    • http://lindendirect.com/tempimg/file/54157465781.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e8d8a8d4d---gebitutipag.pdf
    • https://pima-alarms.net/slicice/file/9346130933.pdf
    • https://kaptenhoki.net/contents/files/kolusaxi.pdf
    • https://eminencesolutions.in/resources/userfiles/file/fesiwegek.pdf
    • http://akbarestate.com/survey/userfiles/files/gowitaxolotefemapidije.pdf
    • http://irk-yoga.ru/upload/files/jomujavapazojaz.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e8ce5f3e5---fufivimadanakowenobepuxil.pdf
    • http://shinyoungvalve.com/userData/board/file/31353643033.pdf
    • http://hydrem.ru/images/file/renaviwaz.pdf
    • http://yetisirkaucuk.com/firma/files/22342947917.pdf
    • https://amatnieks.lv/pictures/image/24285953654.pdf
    • http://tctrack.vn/images/newtech/files/tebemuzux.pdf
    • http://naszemotyle.natura2000.pl/imgturysta/files/jovadolomuxawedilitavezeb.pdf
    • http://kaushalacademy.org/ckfinder/userfiles/files/15203226534.pdf
    • http://www.bufolari.com/public/immagini/file/90609364512.pdf
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/dokelopejotulemokopodexo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2e.bin
db2c3ce70125b930c5c96cc12610a216f011a591e7ecce64162a602f5e9eb457		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2E 10824 bytes
font_01_sfnt_off0000f73a.bin
73f8f11436156fabc41f5e7e19128cf516c300372f81f04dd9dc6bb196cc797a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 17924 bytes
font_02_sfnt_off000125ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 16792 bytes

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