Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca4744678e643e1…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 23:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 80cce05cb3922dddda071be34d9e1cf0 SHA-1: 50dd7a891601b6e83dfe9d231d91aa05bfa16053 SHA-256: 0ca4744678e643e1c36291c6d960290f1a84b2079584ce97bc46934f5f768999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fallahi-sch.com/userfiles/file/lavorovizololuditadesol.pdf In PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/10811740125.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/6475889696.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/duzetotun.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/12778247019.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf158dbd4---14131821230.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/jetozovusoxobofel.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415f9ddfb52---76085241504.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/72120891480.pdfIn PDF document text
    • http://bociany.sk/media/file/69816208000.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/17862970917.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/likotuvu.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/leserazibasepamejikixonov.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/45429395412.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/fonujolagudujajawawonowez.pdfIn PDF document text
    • https://estoniapools.com/contents/files/rebejumunumiso.pdfIn PDF document text
    • http://stringladies.cz/userfiles/muxenebabafulakokizomoba.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/vudomevixejamog.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4148337d---pufejinorireluwodetaded.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/fojakasag.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/6494407963.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f6a125627d42286650f223c15fabde06/54092756120.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/63832179717.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/12409519660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=abhay+season+2+indexPDF 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_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 10556 bytes
SHA-256: a59489ef5cc1909d678ff45e38ef6f6838916c1af127342031b5930d2a22b13e
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 18924 bytes
SHA-256: e26642e8b0eebad244845d4b93bb0c208c28c8fc2fdf4144c67b2056577ce25f

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