Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69c81fd82f589ee…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 00:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52b8b286467d19fb489051ca12052f64 SHA-1: af739387585eb900e2e4beb41f1238d196765699 SHA-256: c69c81fd82f589ee8d0b8e4ff5bd612699729bd22a4e33bb82b10fcb2af195bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/45f0e024c2f6b0ecf730b191bd327147/buwikedefupiridadudo.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/18969429598.pdf
    • http://air-con.ru/upload/files/soluj.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608503121bfcc---48589974666.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/1b203fdb93ea30bfccb04d7e948f35f2/jajeku.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/5c3b9c8565e16f62104e0c218cf21ab7/74963811583.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/kukalutidejeveweka.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24bb3430ec---dabawem.pdf
    • http://bigbazar.cz/is/images/FCKeditor/File/30145067136.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607437195a50e---14099211873.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/digumevoxavusulim.pdf
    • http://www.alfapilates.pl/upload/file/38277761964.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16215325186716.pdf
    • https://aawyx.com/sites/default/imageuser/file/3904285737.pdf
    • http://perfekttorun.pl/pliki/36139680720.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53a09e9c1b---somaxelokibemadozolevipob.pdf
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/xudovedavakusaja.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d8f4f1b2fce635e187e107b9e9c18af8/sudotagaragod.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d58116ed---72581028136.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5s5qiqqt1ijcvq89oulksk50cr/zubitipebizenadus.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/30c4e9d9f4d3bf159a121fc5e881fcde/kizelezunisagosakomad.pdf
    • https://artlabjo.com/userfiles/file/lisevolixegakimoxas.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/7ba506c528e1136fca38605abf623cb2/32104136334.pdf
    • http://bbfederico2.net/userfiles/file/ramakavi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=skin+peeling+on+palms+and+fingers
    • 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_off0000ecba.bin
2c619e71ae8087700496985722a9315059d7db259000d158270e5b791cfa8c72
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 10908 bytes
font_01_sfnt_off000105ae.bin
f095bf2ff97e03eff8c0da3b591a677a93486bcbc6b20dfdb467593553178b62
pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 17700 bytes
font_02_sfnt_off0001332f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1332F 16792 bytes