Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ddbb5dde0cf99d…

MALICIOUS

PDF

84.2 KB Created: 2021-07-21 13:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a3a550b77354e17e13f367c5c9afae0 SHA-1: eda5172ed681e9914ae3b2e47dc96310f0d70d14 SHA-256: 18ddbb5dde0cf99d33d5f18587f04a2303d84eeea07b4b38cc30c634a7869dbd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the structure and embedded URLs strongly suggest an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609766903c6fd---xovovewirojovewumezozine.pdf In PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/4396635636.pdfIn PDF document text
    • https://zold-kommando.hu/files/16709395895.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/potaxojupi.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/jetosixarupumi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607272e21f554---29453963402.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/37436407461.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/83887435244.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d780ef4c25396b6b3e51efde80c92a88/9302865937.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/29994763660.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/kuniw.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/35297608786.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/raninazorige.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/97645597445.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d65e4a60768---97299252312.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/mipujamobamenirokowosixam.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/54bc06ed17714c03890f2adfbca65e60/mowutubomesinoxap.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/53581644557.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/lifawogivi.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/342665215.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/solujamiwapu.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/takujisepewofubefizijane.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886c975e866---bodabosewizepav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dependence+in+pharmacologyPDF 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_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 10808 bytes
SHA-256: feeeddba01b5d881eadd29cc0552b3d2b4b127afcbf014e9723779bfd9410672
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 16300 bytes
SHA-256: 886be29fa1afbff23029f69090c2cb3276bbbd3f06c9bb351226067dcb9c765e
font_02_sfnt_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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