Malicious PDF — malware analysis report

Static analysis result for SHA-256 320f30c99ac52bb1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 19:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f7259e208f523e59a1852d99fbc9cf5 SHA-1: 0eeb092932e05dc9d762abbb8361bf9faca0ca58 SHA-256: 320f30c99ac52bb13794215a9e7f7810f9eb3b4683341cb03e3cf2edbad67df4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the link farm point towards an attempt 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 http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/aecaf8b4af78bfe3c76e338705a366b1/53206110864.pdf In PDF document text
    • https://autonoleggioassereto.com/file/35831683344.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/76534862202.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/63180129390.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378ec469be3---dugomazugoxapawelivise.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/rokisepipimazivetigoveded.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/piselejodikuwisibek.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a16803868---57471237525.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/kafidibatolurise.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/pomove.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/rujebasoturof.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/bapokuse.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/mowamu.pdfIn PDF document text
    • http://hodori247.com/uploads/files/4376912485.pdfIn PDF document text
    • http://serting.eu/userfiles/files/57943108146.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/94517457141.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/39atrhmcc6phou3hnrmdvb89pc/vexatuwa.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/16373660164.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/noxanewuwebozilinafi.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/57249460735.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/kuzot.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/47992463687.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/50727850806.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/nsac6o5rmejasn3fhu3fp3uba0/40717715128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+11+name+release+datePDF 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_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 10440 bytes
SHA-256: d96033ccb28dd2c7c18b75c0ca5c665c53c64eae4b17f10189f0d497e42ecfdc
font_01_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9A 17068 bytes
SHA-256: d526216b2e120c00ce7fc3874c86f7679b69ddc9d259cb17842cb37422cd068f

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