Malicious PDF — malware analysis report

Static analysis result for SHA-256 4626add601e1042d…

MALICIOUS

PDF

88.3 KB Created: 2021-07-22 06:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4eaeaf200fac6c6e5838b2e8a20dde5f SHA-1: 7e0a8c0fdcc2c3b6df2791ca8b37760e5ae7d7a8 SHA-256: 4626add601e1042ddff4ed1f2fe23e250233cda9cbbd6bfb9c25e935c8acd93f
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URIs pointing to compromised WordPress sites and disposable hosting. The embedded URLs, despite some being marked benign, are part of a larger pattern of redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://protradingindia.net/userfiles/file/pepixuvixomibarom.pdf In PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/hdcheafl68qo961vk3i05402e9/bojufizusisojovol.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/51368448516.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd4ad518e---xesozaxesujif.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/8655bbbead0ae9ce9d524f2b6443cfd3/wiwutup.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/tnb51h3on6lhhcqhouobm84h77/69240335565.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876c4e9ae3a---56404206312.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/mumonag.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/cb8db3e46995ac2993638af51d9d2a3c/95943318733.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/49361641569.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/25845123893.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/95827077216.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210606075711134.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/wibate.pdfPDF link annotation
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/rudigabelonozetulen.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/a5e525acffdc7a46f13674893247aa73/xaketamuwasorererek.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d7853db3a---fimik.pdfIn PDF document text
    • https://tessuno.com/upload/files/60f673c1185e9.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad1d084e6f---34229513606.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/63031076466.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/1467680802.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///38380398079.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/pudowofisezilul.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/166f9bbf41ec4bca273e77564116ba0e/87289079422.pdfIn PDF document text
    • http://debden.org/userfiles/file/folenorosorexuxesadatex.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/gagine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+roses+are+blood+redPDF 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_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 10156 bytes
SHA-256: bff3bb4e7e17aea2f2a4ab04e4ab202c29e5b3139fc250c948c401c5fc95c911
font_01_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 16624 bytes
SHA-256: 96d1966e111c80de6e83d70c153de2a4fdb366b6e9f5962b602633e628174aca