Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e512da02ea105a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 00:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5e3f0943286bc3e42244261f5f99876f SHA-1: 0eaffb5d43db82ddf4bf330c4f297fa955db26ed SHA-256: c2e512da02ea105af2c3c57137fe65bd1db1d0e72c566afff76144bae3dbfde8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=pokemon+fire+red+randomizer+gba+download PDF link annotation
    • https://stef-nancy.fr/upload/document/94791616982.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/lirasowozi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/69844986746.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613492527ba43---27429894396.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/buturisexekilumijavites.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/18704559819.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/bibuwi.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/39750981753.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/jipujobido.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/kesodajuxuwedarevojumi.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/wabiwabafusadopowuxawuxe.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/wopitititunudi.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/pinogumakepototefuful.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e70b9b1f9f---sipifiwi.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/80347891700.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/gerukodaxuga.pdfIn PDF document text
    • http://scpt.it/userfiles/files/guved.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/totopiwifilonu.pdfIn PDF document text
    • http://surausa.com/uploads/files/nugawepopabufagulula.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/fepurawaxa.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/44720715828.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/76df2a9d7326c7ca5119b23de52fe495/poxaxoraximasoduli.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/pases.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/89724024142.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/5223846786.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_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 18400 bytes
SHA-256: 75802475ede2c3e598677c96a5e57eae75b69f7ad0a644fb6e52ae6e2ec2beb9
font_01_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 10812 bytes
SHA-256: 2f54dab27a258d8ca47b16722d1c74bac4c5637effd83d28a76849055c6c378b
font_02_sfnt_off00012a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1