Malicious PDF — malware analysis report

Static analysis result for SHA-256 1236889689055fc8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 06:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c2c6af0c98ece02d95fda69b2f40588 SHA-1: c99f02d6ff99183c8df67a1ea937175be95e32c1 SHA-256: 1236889689055fc8466cb69daa11f93df375b6a476de3244ebddf2d7ca9d7749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to direct users to malicious or unwanted content. The presence of UTM parameters in one URL indicates a tracking mechanism for potentially malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://soechi.com/userfiles/file/14660358609.pdf
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/12584944356.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be1c45be43---modewukegabimesowiwebod.pdf
    • http://cross-winds.in/upload/contents/images/images/xafemibimo.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/75820663999.pdf
    • http://thunderstar.cn/userfiles/file/20210907185526557507219.pdf
    • http://morard-mcf.fr/data/Files/4147086676.pdf
    • http://www.hydro-tg.pro/upload/file/22526659654.pdf
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/lapix.pdf
    • http://ctnphrae.com/ckfinder/userfiles/files/64240905022.pdf
    • http://panziofabian.hu/fck_kepek/jekofifadawujararusuja.pdf
    • http://myphamvickwhitebeck.vn/luutru/files/40159277961.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/27723943521.pdf
    • http://hagelkonzept.de/userfiles/file/bemazapabob.pdf
    • https://larrialdiak.es/files/galeria/files/13943191851.pdf
    • https://buffinvestment.com/upload/ckfinder/files/52912828656.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210918_28216618E715F6D3.pdf
    • http://cmtoolsrental.com/user_img/files/20452345509.pdf
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210914130004.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1874d0e4c35b8a20ef59417583c845e0/fefixanolaziwizigiten.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161359cf6c2d83---nejananisuduros.pdf
    • http://thaifilmind.com/upload/files/97727649604.pdf
    • http://lso-msm.fr/userfiles/file/watovaba.pdf
    • https://broadcasthub.com/ci/userfiles/files/86297293676.pdf
    • http://kartywspomnien.pl/uploads/assets/file/poromuxigi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=free+call+app+apk+download
    • 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_off0000dac0.bin
1f27e414ad279c3da6ebe202bc61a26a91efaca5b02e6aecb3af510174bff0f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 17972 bytes
font_01_sfnt_off000109b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 16792 bytes
font_02_sfnt_off000121c8.bin
7ac39684ef22c73d2d18347356a703d5e6893224b8164e597d5749bc0fea54ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C8 10304 bytes