Malicious PDF — malware analysis report

Static analysis result for SHA-256 82286599091dc392…

MALICIOUS

PDF

87.4 KB Created: 2021-09-16 04:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d3ae44ae6ddd7bc8c4232ccc075110e SHA-1: 18db66bf70788c1d7bd85b574adf87ca0c07503c SHA-256: 82286599091dc392377a9d585d61361c339b6eac7ecb8a85ad6e4a94565b4f34
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to various compromised websites and disposable domains, likely to facilitate the download of further malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=league+of+legends+wild+rift+apk+download+for+android PDF link annotation
    • https://deepex.hu/hirek/files/xeribumojadugefesol.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/76057882261.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161410f41f3f17---32435904106.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/vovukaziganagegatuz.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/90201079988.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/jewakuponofaje.pdfIn PDF document text
    • https://festacontinua.it/public/file/70078544238.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/nusatiseximiruvefupor.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/83209490844.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/91956584968.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/83411884743.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/92606350878.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/magoteduvat.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/vogajewu.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/6675834671.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/5427232015.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141df630ce43---94136223530.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613276446f0b1---naturotenisotusa.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43518927043.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/jilojupekowimolixiza.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/76441135361.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/lufedigovufakalejutolo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dd7dbe6d81e2fcfced8633bb77dfd944/komixebegerufeje.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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 10908 bytes
SHA-256: 5e3557ba9ea0cd810937730a370bc7664e6c420597f5dcc4376219615ece2d83
font_02_sfnt_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 25364 bytes
SHA-256: 510c44ce415834c89d649066add8a0ed2809337e5f787ea733189a89578fc342

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