Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efaf02c1086b260…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 06:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4e8da58e86b29929d9a18bab77160f8 SHA-1: 6d591b04d57bccca277d57b8ad86657bc8a71bab SHA-256: 1efaf02c1086b260e7c388cfa85613be9a0839f72189cedea18b46d890d4c3ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://laborke.ru/uplcv?utm_term=williams+pinball+apk PDF link annotation
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/79271961857.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/918f7d0e1e7d01e2772e252b2a71441c/fuvujinabubesus.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/88956223737.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/8ae19dd68f461306ad3fdad0752ec381/27266890932.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/58119470003.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8cac4253e80823538614bcd38aa3a648/xexutugibutuxasanod.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/50757599175.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/15253143083.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/jowesamosulolatekura.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/61910805261.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/zoguzotikaxaboxajaxedew.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/55351605571.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/84106033272.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/4877348338.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161420085e3b24---lonenix.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/zijipefu.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/68408938625.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/14303210038.pdfIn PDF document text
    • https://auto826.com/uploads/files/48092289470.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/zafumakewula.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/mojolel.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/bezubegokajevimo.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/gowolupifaj.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/91329969016.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/16216680388.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_off0000c2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 17376 bytes
SHA-256: 5f96788af16f07765371025122df1e150d006e60e256cb513f3b32b6f88681ce
font_01_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 10188 bytes
SHA-256: 6d54ff66ca9b4f83d097c79dbc058a696ba2f1bf20fb503990bc380f54ea3d9e
font_02_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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