Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d7118945230c85…

MALICIOUS

PDF

72.4 KB Created: 2021-10-11 16:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2c8908fd12c2a1cdb9afaec5b57c841c SHA-1: a1b3e2233d069b05ef1176bfcad12d298f7fabef SHA-256: f7d7118945230c854dfe6f0e2e854df16a75851bf96a750d6f6a6cd1118a765c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple external URLs, several of which are hosted on potentially compromised or disposable domains, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://biholka.cz/uploades/userfiles/file/71817524973.pdf In PDF document text
    • http://fnathservices.com/upload/file/55174047256.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/55520156486.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/79818627967.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/85968600107.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jaduturugiwinaliwajapaz.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/80502564354.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/363883176.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091419163672.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1614f191782bd5---fodajolabuxoxifefixuxa.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/d8lvlghmt8gu935p3ipdcg5vf6/ravil.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/zibukaxokuwusodu.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/69412363980.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16153c1d52d1be---33844692400.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/wewisu.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/42866476300.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/79156062005.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210908001045_2031160415.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/rarewasazov.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/doledozuwuripuvugeg.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/43632428349.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/96933443924.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9aba8f0aa57e73c9dfd722ea9ec2b99d/delesubalipepevuzawimoxi.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/sodogaka.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/94341433457.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/50632564037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RC0zOYPQW8A/uplcv?utm_term=fluidized+bed+agglomerationPDF 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_off0000bdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD3 14880 bytes
SHA-256: 5ed92156050708adebf2d015160f5b8bf02ae46aa14cae48901c1ad6c0bb893c
font_01_sfnt_off0000e348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 10700 bytes
SHA-256: f1d3222b4986777c2cb89c16f6afcf679340cec53bf2f5f0c147db2fbe080dec
font_02_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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