Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3749a267e2db6a1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 00:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7151513e1952ce4dfbc8191c219b26e2 SHA-1: fdfbf098e5d7772cd080cb5b20a74a90b629f202 SHA-256: c3749a267e2db6a15b7579d09ddffee35276ae7df48ff50592f5875a794a42d2
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 phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://alsultantrading.ae/userfiles/files/65296635084.pdf In PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/35712797880.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/7481761071.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/60366695554.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/wetokepanog.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/womunorita.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/81896425984.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/82558c5487ff9a0065c1b75dc6649044/devenudotezatobomet.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/22528417094.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///2445836586.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/72744865065.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/77594807051.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/74503642691.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/wimilasezeliwotabevukurux.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132b1080b58a---jejivinale.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/71134457207.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/jf7ginnbv13b1qsgvdkfdqfqr7/15218571418.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/dozude.pdfIn PDF document text
    • http://lulanjina.net/upload/files/levupijazunutuwotuzat.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/58640663508.pdfIn PDF document text
    • http://melvin.cz/data/91416455850.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/74019778011.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/27275713046.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/movuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=operations+management+jay+heizer+solutionsPDF 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_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 11128 bytes
SHA-256: 751ae6aea9ba369d928280cdea06001e57e9f6f0cfbcf0ba1f360f7132dc0e64
font_02_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 18536 bytes
SHA-256: fb6da1e88156a6f93494a3a65dde97cc8389d3563a3f1cb02b7ab283b6efc1ba