Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77ce68f95d5c722…

MALICIOUS

PDF

69.0 KB Created: 2021-09-18 03:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 293437b1fa9d5403212c4096b9bc1553 SHA-1: f4b79e63f0911079a30ac68307c882d6890893c6 SHA-256: b77ce68f95d5c7222c150953251b1c7d030196694b34b981b1fc11360c2c1ae7
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which are hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=see+hidden+instagram+profile PDF link annotation
    • http://85560891.com/upfolder/e/files/20210917195616.pdfIn PDF document text
    • http://tavio.su/files/file/kupubusedebosesakesake.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/40804342127.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/67967751277.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4f3bc9df---bakivamubamasepokidaxipu.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/24adc0bfefae5de49320e808ddf25d1b/31164678486.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/93106086950.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/54442506123.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4245289d---vitiwefidojitozovefa.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/wagiratejunox.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133f2951fa24---wutakalasadikavisenosumo.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/rabonex.pdfIn PDF document text
    • https://redac.ch/upload/kafuresololowom.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/78169876313.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/56020716586.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/7048037058.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109091715319753.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/xebadolojusol.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/3732512213.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/zulonadokewodawufegeje.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/wurunenagumajidukuvo.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/18185690609.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210917200327_973129676.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210904_247DB2272D012DAF.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/28198297673.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_off0000b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 11020 bytes
SHA-256: 461393911abb59f4b426417552e9b8a04eac325a54f53c7796147545a021a5dd
font_01_sfnt_off0000cac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC2 14484 bytes
SHA-256: 4786fa5ece3174025b050f9a539021f3b6343c4ef3534e6ede70df1238d08c74
font_02_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.