Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7deea22fdce6a6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 02:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 976958d4f19f60d27e701c3adf81af3f SHA-1: fd4ee9126d4f1b155765a882a1023319f460bffd SHA-256: 8c7deea22fdce6a6172192952cd14eaaefa5b47ce69d838939777f92f1829039
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, a common technique for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to evade gateway scanning. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drafthe.ru/uplcv?utm_term=upgrade+rom+android
    • http://kidneytracker.com/ckfinder/userfiles/files/46805765150.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/zoravezokabikufirev.pdf
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210908051202.pdf
    • http://topstec.com/d/files/riletiminirudofikezaxuzul.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/sovaporozukulovum.pdf
    • http://educaholistica.com/resources/img/imagesck/files/37438542202.pdf
    • https://tonerihned.cz/userfiles/file/tiwuxirizupexiloputezi.pdf
    • https://podimercrm.com/img/files/18899270789.pdf
    • https://ou-ravda.com/ckfinder/userfiles/files/76042348290.pdf
    • http://cleanking.net/userData/board/file/wonawuwamu.pdf
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/30037579249.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140208f4a59e---35316616882.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/gg2k4r5uadtdf8og1va190vgtm/85382201494.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/fanilevexisipe.pdf
    • http://orenprom.com/img/account/file/libel.pdf
    • http://ssss-sangam.com/userfiles/file/90834431860.pdf
    • https://eqonetech.com/upload/userfiles/files/nipaxomivovozatosuguliren.pdf
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/nuvuduzusobor.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614170a947495---vobopigiseripev.pdf
    • http://ingatlantv.tv/userfiles/files/3406003131.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/zegasujurojuwisojowo.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/sotedawomunix.pdf
    • https://mytekas.com/UserFiles/file/wotivimewijuwexuxol.pdf
    • http://genarchi.com/data/temp/file/wenekepalezaradomud.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_off0000d497.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 16792 bytes
font_01_sfnt_off0000eca9.bin
edd1cafb226dad41bc3be8e34c6b0a4dcc3d46de999cca0f8f92865327e5549e
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 21060 bytes
font_02_sfnt_off00012306.bin
7a249e2ef7a86f448c76cbfb45262d6743e1443de2fbffd3d85b26924aafe798
pdf-font-stream PDF embedded font (sfnt) at offset 0x12306 10428 bytes