Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2d6fd1345d150c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-24 01:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25dda15984c4bd2fb3b6bc4a8ed867e6 SHA-1: 35cc86f0971f0e8535d14e7b720c4eb3c434d37a SHA-256: 2b2d6fd1345d150c7aa370de85a35922fbca77bf53c0563706b60d5674c5c6b1
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic specifically points to social engineering tactics designed to trick users into running arbitrary commands, likely to download and execute a secondary payload. The numerous external URLs suggest a link farm designed to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://laborke.ru/uplcv?utm_term=chrome+new+window+shortcut PDF link annotation
    • http://cachnhietwin.com/luutru/files/7928202368.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/9176278017.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/tebar.pdfIn PDF document text
    • https://vitanov.rs/files/61747658859.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/zisunaladujubowanure.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/kupiguwedumogajab.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/lisibosimiwidel.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f96a8a1d39---radazobuwoji.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/44344469199.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/telepotepopapovatiga.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/51884661241.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vmnjm0qqttccba5h6tq5bbb6dt/49802129472.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/solatuvabavuxe.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/15291036768.pdfIn PDF document text
    • https://12tiga.com/contents/files/labuz.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/19511259848.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/32037160118.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/47266503507.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/lubagafuwugulu.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16140510b992fb---vizomovedolafaz.pdfIn PDF document text
    • http://aztkgb.love-mrt.com/upload/files/26117440517.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/kafamuwogaletasijatez.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/a2212020c88f21177596fa8614a277a9/zusugof.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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 17320 bytes
SHA-256: a213670af5c0b7b8da0ab5e8ddc1e69a5062847c44783a4a2147f6a5b12a198e
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 10644 bytes
SHA-256: bf60d80895fd351c61b4e3864ad97aa62674875fd21d1cc52c6b23242c1ca18b

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