Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cab4e522129c584…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 13:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1dc6275a587a596c67b5e64854d78ed SHA-1: 62852db9f576ec7f6a3f0e23b6eaa37ef250c6c7 SHA-256: 1cab4e522129c584830076f12c2e51516716c64943fdafe49da561a94e2a3aa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://netwindowvn.com/uploads/userfiles/file/21814611623.pdf In PDF document text
    • https://abofahed.com/userfiles/file/9695017072.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161301af25fcd4---pulowawasibanelijup.pdfIn PDF document text
    • https://coevent.ru/upload/files/guwumejezekamebakup.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b91c20661---xasowunowipoxigewox.pdfIn PDF document text
    • http://szcftz.com/upload/mesetipajukilige.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/60141765636.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210909133040.pdfIn PDF document text
    • https://techlan.pl/files/file/32296339377.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/mazipoparan.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/gorivowitunixe.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/31656892919.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134c478d3871---78407532210.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/82421995934.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/wafabobimefowog.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/5f5555199b6e6855821d26b6137842f7/nidez.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/lerutodakena.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/wufipewipux.pdfIn PDF document text
    • http://svx.su/ffile/file/zupusaxikuvizutoxin.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/43509176922.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/samasak.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/molozesoj.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/048f071a5570b030ff6edb3ebd1f0166/puxof.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffae13ed1c---91767860047.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/pilamewetujitaxibebis.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090400265073499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=plus+two+physics+practical+record+pdfPDF 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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 17704 bytes
SHA-256: e60fe02397d6600c414249a5bab477317a836d3ed255202c28d5d980bea8909a
font_01_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 10912 bytes
SHA-256: abbeea4a1e235e5bf9244dd9c4aad570646bccef9f7be9b8de839e70a5040339
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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