Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc304cdb4dc23aa…

MALICIOUS

PDF

87.5 KB Created: 2021-09-18 06:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39685654f2a4b8044194501ed5721f17 SHA-1: 5adf56eff73407029f03e914ef3a3612b47a469c SHA-256: dbc304cdb4dc23aaa802ea77e1b7e4e8e2c26d67eed284b0c60c45eee0845b1f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised or disposable domains, which is characteristic of phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a malicious intent to redirect users to malicious content. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yanartekstil.com/firma/files/92731930155.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed8a45039---55866788042.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/wupegevabukoladu.pdfIn PDF document text
    • https://value.ae/userfiles/file/52569819194.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145256732c71---28363719719.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/61970586573.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/83033852821.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f368030539---sazidorilotagovixikow.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8ef0d8cd676bb166d1723e28387b6a78/firisuwov.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/puwamigovob.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/0i75qi1uc9nb67v4j7503a0fdd/94016370513.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/54911204243.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/totoragatuwuselekasemo.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631235172.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/65771211237.pdfIn PDF document text
    • https://granitnet.hu/editor_up/47100655905.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/32793275930.pdfIn PDF document text
    • http://zgic.ru/!upload/files/lenexomubipokuwanawo.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/bonabuwuzawoludin.pdfIn PDF document text
    • http://ccshecea.org/upload/files/nifoxikisozezojopisu.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/dubolitogu.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/tazabefakujegesufagelawex.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/labigobefo.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/gaxavuwaxeronuge.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/11623981287.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/63764430458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+proton+bus+simulator+roadPDF 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_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 10748 bytes
SHA-256: fdd9c29958aaeed5cf26adfdff2008817f4b6ee8772d7a8c8c30624ce6b22007
font_02_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 17836 bytes
SHA-256: 99ec2239c73cfe535f0f6713a9601542f33368fff01a1a06fba2e924b8134fde

Open this report in the interactive analyzer, or submit your own file for analysis.