Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7c121a23191b5e…

MALICIOUS

PDF

82.7 KB Created: 2021-07-30 00:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 80e1e2f6afc5469e6410fa2feeb4b8a5 SHA-1: 92c588426b76ecc13bd1dfbfb8d95dd01d27cfcd SHA-256: 2f7c121a23191b5e75ae3947c71270233e294730a6d571606739fb5493871dd6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 http://pneusmarene.it/images/file/14391440341.pdf In PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/88044539222.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/63970924390.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49d0939d2d---zajidinozutepatitivibo.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/37499976191.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/bufege.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/dd40eb5acfbd2dd09abe9ea981fd0a78/nudizamoxawilib.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/us9o25ciaus1dt2mt9mqiedkft/bitegagigiturim.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/spvtgd2jrnidnnk2is2u2qlss2/24218302369.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/0qsgkgpala17gg3eh6jcuclup5/12351371012.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/76411752248.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/042a0cbb72207ab1604693b33a2f982a/25333505539.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/81713269480.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/89546679502.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ddd0515ad---92342108739.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609444d2cd4b8---58276614730.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610317fb35340---nuxafala.pdfIn PDF document text
    • https://medtek.vn/storage/file/nebumubaluvogobute.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/tewawunobaleta.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3710d12ba---98876848446.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867ce87860c---pedaseg.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/60893732977.pdfIn PDF document text
    • https://giustofiori.it/file/figavebifu.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/navegezibazerepamokuxo.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/583a434a1acf0d23d037daf895599982/parijikebudogevugenenuwo.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/33a1fc425a2059798b931ecdb93cc655/67248631427.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd42a98951---puzekupukasogukubaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=chunghop+universal+ac+remote+codes+lgPDF link annotation
    • 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_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 11160 bytes
SHA-256: 5e3b6490f6050858abc82a94c1f510e52761e9371393058c3e381f71fe9a9c6b
font_01_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 16780 bytes
SHA-256: c94fbfc09c12d2f91a851701b0df7106f0ab03c506d6f21970e24f239954ef5f
font_02_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1