Malicious PDF — malware analysis report

Static analysis result for SHA-256 a685e8082f73d30b…

MALICIOUS

PDF

92.6 KB Created: 2021-09-19 16:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a670d6e69a71c27fa73184454b361d17 SHA-1: 3ae57a841086a94cc99f1ff5777d5dd7d9a1a33f SHA-256: a685e8082f73d30bbbc5a7c2a6f08906847335a8cf4de54fe5f64e7eca472b9e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristics suggest this is a link farm, likely used for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the nature of the URLs and the link farm structure suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://chcial.ru/uplcv?utm_term=coc+cannon+max+level
    • http://dichvuhieuchuan.com/upload/files/36979868985.pdf
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/mopape.pdf
    • http://clickvay.com/upload/files/45532545824.pdf
    • http://intertravel.hu/_user/file/wizekodadonetewipiz.pdf
    • http://barexkft.hu/userfiles/file/10280247444.pdf
    • http://hyundainhapkhau.net/upload/files/69243200259.pdf
    • http://sanarina.de/ckfinder/userfiles/files/dotanipowon.pdf
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/bafajezosa.pdf
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/19002196871.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ju9hgkas45k6dufg48b1cum1g1/76499126163.pdf
    • https://nexapos.com/upload/files/49778409096.pdf
    • http://taigesw.com/upload/files/mazokedorewufakagu.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/joworokijazoboj.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/14353200140.pdf
    • http://celcg.pl/uploaded/file/3323126580.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/16710555441.pdf
    • http://phoiinnhiet.com/images/uploads/files/67658114840.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f622defba3f776fb1baba5aeac809b88/15873103778.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa3200610---valotokakukepabej.pdf
    • http://turskazka.ru/ckfinder/userfiles/files/70120034302.pdf
    • http://bioaec.com/userfiles/files/91698390114.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/15761302870.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c4ce27f8d30a40dafb29a364b3d8fbef/birawudoliz.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_off00010a7c.bin
5c9e4e93bee03f3e67d0149aa35fdf964509245a46558c8430d1b29daa043258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 16860 bytes
font_01_sfnt_off00013624.bin
826f04938f40d71832925ba9890b97d893759abcd0295dadef507a470ed974ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13624 10132 bytes
font_02_sfnt_off00014cd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD2 16792 bytes

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