Malicious PDF — malware analysis report

Static analysis result for SHA-256 891c7fd71990f6cf…

MALICIOUS

PDF

92.8 KB Created: 2021-09-17 18:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a82fff40f0ec5e13a8e204edb630e69 SHA-1: 20a496164611b5f87e6d2d8e25e104b64feefa99 SHA-256: 891c7fd71990f6cf6d0523dc1131e7e6d4fbcecb77b1f6badb796081399d27ca
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution attempt. It functions as a link farm, hosting numerous URLs that point to other PDF files, many of which are hosted on compromised WordPress sites. The primary purpose appears to be redirecting users to potentially harmful content, leveraging a common tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614147a158dc4---jitosapulolozabeloxalejo.pdf
    • http://1night2daytour.com/ckupload/files/jawomo.pdf
    • http://digitalpolicycouncil.com/imagenes/file/dafitu.pdf
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/pokilur.pdf
    • https://agrilaui.com/userfiles/file/69711717259.pdf
    • http://4seasonstours.in/userfiles/file/sagademetopose.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/978cf0a3542957b5d609bbdc008485aa/61752843158.pdf
    • http://lubrifianti-auto.ro/files/file/kavivakanadevugapitugax.pdf
    • http://fujiya-la.com/uploads/files/1287970549.pdf
    • https://rocksoliddesigns.biz/userfiles/file/22857013191.pdf
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/3272157245.pdf
    • http://nousgarage.com/userfiles/file/moxitovam.pdf
    • http://asfalon.com/__files/file/fifogerinudezovuwowexa.pdf
    • http://vinhthuan.vn/upload/files/merofejewuwakoso.pdf
    • http://119pump.net/d/files/87431264524.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/40042971264.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/819301513a00d4658f5beae257764e05/tukabubokakonijinulisuv.pdf
    • http://wienbildarchiv.com/upload_files/files/pamilik.pdf
    • http://portalcom-b2b.es/img/user//file/_0397795001631142114.pdf
    • http://dr-onesrl.com/userfiles/files/49914280967.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4vsmtc6gsa9fjsobbi73ier863/27707709153.pdf
    • http://amsasecretariat.fr/userfiles/file/fatuzepenejefatuna.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d9075dee86a800ccee185e5b20e6508d/vopegixufowuju.pdf
    • http://isystem.hu/userfiles/file/fukow.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+get+pokemon+go+cheats
    • 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_off00010478.bin
09a6ea445722f7f176a54c7009a779b8818aa50b862a9efbed75238ce993b027
pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 10752 bytes
font_01_sfnt_off00011d19.bin
93468bed3db2e0f1f54d5800da23284eeff04910ebfe9e34591613752cdadd39
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 18620 bytes
font_02_sfnt_off00014d56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D56 16792 bytes