Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca0070a2881a8bc…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 18:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d13949a5254d537119c7ab18fadfb0f3 SHA-1: b98b70d9d332eadcaca9fd570eb6590696d62347 SHA-256: 1ca0070a2881a8bc85c5923a3d8d357d23e22f20728ae847aa77e66b7f7629ec
196 Risk Score

Malware Insights

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

This PDF file contains numerous links to external resources, many of which point to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and link farm nature suggest it's designed to lure users into clicking on potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=black+widow+full+movie+123 PDF link annotation
    • http://aorganboys.handyfriendship.com/upload/files/zavegigojifabiwan.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/samajabijemologurig.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429064c8280---kotusurerudikajufob.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/73410340152.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7c313022---87937043950.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/aa6551010ad289ac954d700918cd9dc1/70765454300.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/43616805429.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161351a04133da---kodebawofepubofisade.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/31565573022.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/gedamuxedujife.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/10777699501.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7a63f128c746d28efcd0301a02219af3/mujinodulidavakerutarul.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/dilumakoremetulaxobasivo.pdfIn PDF document text
    • http://josquin-capella.de/download/rututap.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/76783662353.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/90050703011.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210917173629.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_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 18468 bytes
SHA-256: e187a9b8f0c1674cb54762ada875ec5f73efa9977bf4fd156b6ba68e8dfeb4b3
font_01_sfnt_off00010bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D5 10908 bytes
SHA-256: 08769d807e3a51abd7c6df3c3c2640fd82d073a3c57d9fa669f42b8c5b8a0428

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