Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c49abe07a7e64f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 03:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42bb70a73a073d0a0c4807410f2e8116 SHA-1: 5eda2e74e946b4cb146ac62fed8e42719128947b SHA-256: c2c49abe07a7e64fe84ea4134ea1ea9059b4779a680b09c42ebaa696fdce75f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=omegle+chat+on+phone PDF link annotation
    • https://maintogelonline2.com/contents/files/robatatifata.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/gedigisadetumudov.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109091931579276.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/wumawenoketixojero.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/97333886833.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/poguguw.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/12712147736.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/zunerodejefukakefomage.pdfIn PDF document text
    • http://www.agot.pl/upload/file/61222878296.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/denakogidiwifebuvufuxutu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b910a7c4e---67232833168.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/45890043902.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/lezedorugodoruxoxemevux.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8795de283---jalepafipakoviso.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/dibinagobinikuxegure.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/xurez.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ad30da4c580ba1fc9a1afaff096e49f0/41330938257.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/2p26i5eq9j81jjq9lbibqs7398/pediwozakatapetakemipawe.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/81458568449.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a2d224ec---49392567056.pdfIn PDF document text
    • http://healthywithhart.com/res/file/58920566714.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/kewedofetunilis.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_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 10488 bytes
SHA-256: 94341e585bf53e28e94808d26bcc128a4a1f590f40b6d13f820302da47add8b6
font_01_sfnt_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 18280 bytes
SHA-256: 5b0361b92b4275a16d9d1eb26d44b8951a47079317e444cd8ff61bfabbf71883