Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab123de98d0a0b92…

MALICIOUS

PDF

75.8 KB Created: 2021-09-28 02:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 122415c189047083943990f103d3da2e SHA-1: 6ab025aed6b3337dc97035443acf541a275bb5aa SHA-256: ab123de98d0a0b9291406c1b9ddf192f077ff142d59ff2a6b31b651134371a7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions or redirect users. The presence of multiple external URIs, including a link farm pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution scheme. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to download a second-stage payload.

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://infrive.ru/uplcv?utm_term=data+binding+in+fragment+kotlin PDF link annotation
    • https://euchebnici.com/img/file/35023364656.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/fupebefutomep.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/497676cd55868aa9eaa89b0a185c2db2/81175059605.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210926003105.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5c45105a5f4fa1b7ed436bbbc471b0e5/viwakisubiterimumotew.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7459a466a40ff7d023880f998d616679/69434686286.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/40231706709.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/45422173434.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/26614319652.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e6d471990a046a0626c541230cb6ee13/36562473309.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/fevafabem.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/95aa9d1ff694e55efd768a7bb1e7dd09/fumopat.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f71e603b91---gevapijemudufedife.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/boverorigumitimiwizi.pdfIn PDF document text
    • http://anm-av.de/uploads/files/metufinidolifuxokatosu.pdfIn PDF document text
    • http://josquin-capella.de/download/remir.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/17858016469.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/57430076950.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/65530781076.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d095b61d6---46957644231.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/45088760017.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/mufejixisirozelodivu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614608f034984---famezived.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/5458387669.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_off0000c029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC029 10760 bytes
SHA-256: 215cc7ebe3aa94a48ac236aa543707f29f3df885fe1d05d5697849e334f9f195
font_01_sfnt_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 18828 bytes
SHA-256: 21496494a2a2655f0c15cb1b011b519a062f6bd55a9403b0249511b66d15315f

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