Malicious PDF — malware analysis report

Static analysis result for SHA-256 48cc11ba2047630c…

MALICIOUS

PDF

90.2 KB Created: 2021-07-22 10:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32fc164bb90c066dffa820a6c2ee3030 SHA-1: 5d91a769f9a21131ea64ff978cf8e3245fa691a9 SHA-256: 48cc11ba2047630cbaac27532701e7a79b5be298f25539263397f9984f0a8470
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://alliance-ltd.com/userfiles/98885866020.pdf In PDF document text
    • http://nowyhotelik.pl/userfiles/file/30391886624.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b8ecc5a06887a8d1a0a798420cda0726/49986112846.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/5401845497.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe7da601ae---21891498565.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/51253859900.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce22419af4---xidiponazoku.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ed32b6d44263e26270550391ec793151/60322635247.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/5iu9to0hog20pqe9ggt4vku792/45656038577.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/nezet.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26f47b5679---kafotowizu.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/tegevinid.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/9du6cd40s5bul0obm8ps0b7f44/68629498478.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/kukibibuzilivofetujipijig.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/srtj39hksvr8k1icd1nlc0te1s/vuwaxulogolil.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6a7c7948---sijege.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9d444a0d3ea4ccf748c73693b6d4390/nafekuwugogutof.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/feluzokuroxajugutisifolir.pdfIn PDF document text
    • http://surtek.biz/image/files/20150115_055016.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608115681796f---xidobiraf.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/nqkpqqi5egamjj3q50ligvm0h6/tuvewezamawoxup.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/potib.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/20303179279.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57ac06b66b---9674845680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=hot+and+sour+soup+ketoPDF 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_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 18020 bytes
SHA-256: 79dfe4c819ed547bcb8f36c11317ec0a000c8eecb7f9690e7369b1c3eb640d3a
font_02_sfnt_off000142a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A3 10432 bytes
SHA-256: 78dd75b333ed742f9e66f2429094fc64a8285e973832131a4972d9fdfe069d7d