Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c43c8b56907a09…

MALICIOUS

PDF

79.6 KB Created: 2021-09-02 00:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d337e74f6b8458aac1ae78409eebfe16 SHA-1: 42110aecafbba34997db0736c8335dc2b94065d7 SHA-256: 18c43c8b56907a096687bd231ac13f1fe6d0cac239da12d97f07bd2afda8d4d8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It functions as a link farm, directing users to download password-protected archives from compromised websites, a common tactic to bypass gateway security. The presence of embedded URLs and the nature of the link farm suggest an attempt to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tomaszfilipczak.pl/userfiles/file/gibiwo.pdf In PDF document text
    • https://dcmheavyequipment.com/admin/images/file/25156570403.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9c431731ec63689bdf622f5224d39f94/jatuwuxowivamemasafut.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/pinuwevup.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1fa5f2b0633520bd87402b7ce51195d7/palimilakufamawili.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/nofufivopazomifari.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/19947dc88dd1e5077d3f3bde17477bbc/gefobupoji.pdfIn PDF document text
    • https://activepymes.com/pub/file/nafaxijuwun.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/xuvefovosuvowapogawuvazud.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/45433393924.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/fidusififomaxaguwapixugo.pdfIn PDF document text
    • http://195exim.com/datas/files/14395823592.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2146f28436---90525111436.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/59030102323.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/69b0k7bqvlar7n5o59rmpb4fhk/vixudefuxenegirikewumif.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8534b9b746---xojevizegafulufejaf.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/68401736233.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b2641c4f7---86501468843.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/45113562232.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/10122872284.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/zinukafaradukapijal.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8fe2e0a16---45553699583.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724e8383d56---murametolijakibeji.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161014178b20d9---90516739973.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/wikaxalinuwaxerivarol.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/91923114316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=nfs+most+wanted+2005+windows+10PDF 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_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 17544 bytes
SHA-256: 02e99fe47a0fa10497f941df2b3608a8b60192b13f2db8871e8e8474297887ce
font_02_sfnt_off000114a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A8 10860 bytes
SHA-256: 78bc1122ae83250e84f9e51b05f815af7e775c2bb9fd21b459e5c8e80e9b3618

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