Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd517dcaf20588a9…

MALICIOUS

PDF

74.2 KB Created: 2021-09-07 05:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a64a7d7b97cf9726af4b22d8c6a16011 SHA-1: b1d85e8f54fab006fe23305e5f7a4b6bab7fc1c0 SHA-256: dd517dcaf20588a9611d66be4806238389fd7d704704c501fe17f92eb709d03e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, including those pointing to compromised CMS uploads and link farms on disposable hosting, suggest a phishing or malware distribution scheme. The file's purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=basic+clinical+laboratory+techniques+pdf PDF link annotation
    • http://www.hermosabeachbungalows.com/userfiles/files/78069938314.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/86303caf2e8e462bf954317f0fe7b06c/33412691742.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/zojebadineku.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/51887563016.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/4b6bd7f8e811a7f10866fb5a807c7cc1/wolirapisevomaxebaz.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/nujopuziwe.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/kakifaxinaweje.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/6147963135.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/92928740464.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/takufamale.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32436c6133---wifuxoxitiges.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/pilutilezuvinaxixujogukak.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/31618984792.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/vuwutene.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/54941087843.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/levixitalarabuz.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/0c4dcd92b94680b3941270747004ffb1/3200669694.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3q8pec6vnk4sqad1avh8k997m4/27312995364.pdfIn PDF document text
    • http://robbes.nl/media/files/36981198414.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/74903543379.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/tugipabalinutidifusudonun.pdfIn PDF document text
    • 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_off0000bc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5E 11268 bytes
SHA-256: b7f3f75601ea52ae1c96ec113cc625c0a47b5992e38a0123c07a152978c1aa64
font_01_sfnt_off0000d65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65F 17112 bytes
SHA-256: 4b73e745ff0e99514842b0a4d4a194299df79152b9e788472721d9c47c5811c5
font_02_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1