Malicious PDF — malware analysis report

Static analysis result for SHA-256 998c96b71554ae32…

MALICIOUS

PDF

69.8 KB Created: 2021-09-13 23:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1e7111e8ab271be61d2627b0487ceaf SHA-1: 9e9121b7c2dae6bf2b270746bea7f22a1c5ade1c SHA-256: 998c96b71554ae32e968bc27718c3e59c37762b778d9d91f0006345f3e96eded
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to lure users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://laborke.ru/uplcv?utm_term=gta+vice+city+android+game+file+download PDF link annotation
    • https://idealist.ro/userfiles/file/vesulogavukubotajuwikagoj.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/siseradejasirifer.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4831081c---kenifaki.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/xozelolumijizobi.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/73828529877.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/damogomojefazolozotiw.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/51390109902.pdfIn PDF document text
    • https://jss-moms.si/upload/File/28317739839.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac84b3a88---kejafoxajimoso.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/xivizudokabebasew.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134fea56c89c---bijixopopusa.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/zajudomusugosoma.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/lelip.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309b0fd3fdd---powepunebusosamotoxo.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/latujegejajevodekasegopiv.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/43318784503.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/jujipilapevalejeparoxegu.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/48438060157.pdfIn PDF document text
    • https://linker.tw/files/34471634724.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/9403083968.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/68920903408.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369c7def9b4---poguralamotufodide.pdfIn PDF document text
    • 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_off0000b1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA08 15332 bytes
SHA-256: 055ba41f6325b8c2924b1faeedfe3211c01ea978fc44a27dcf8beaf3a8143f9f
font_02_sfnt_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 10956 bytes
SHA-256: c1ed645098be97b194e608efef73c5f7d11e1c5f3fe6996fd2af828d0766527b

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