Malicious PDF — malware analysis report

Static analysis result for SHA-256 358b53067b1c4c11…

MALICIOUS

PDF

81.7 KB Created: 2021-08-24 07:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 54b83878d95c796228dedf93bcf43832 SHA-1: d22f932d93787d5c9ff8a6f35cb91b296284977b SHA-256: 358b53067b1c4c114f9396dd65b0327a7d614b64f9f50f2aeecdfc8b6c5220e9
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 0.9917

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://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df8d33f79f---58063287889.pdf In PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/zevirojajuj.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ets6fgj96fmrla17l1knvqqd3t/42076402415.pdfIn PDF document text
    • https://elektrona.cz/files/file/waxuzejege.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/92909489867.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c4b96c094---31827321062.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/66590774962.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160fa78113e63e---nekizomotekonabagas.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/jelijabajimakunamaxi.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/30506663756.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df70d6c6ef7---vapudilurukenijisad.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/sisajiniwebejo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91dd9ee73e---pugopasul.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91e915f5f73e28e9275667b50e0f4d8c/84252829018.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c4fe355141a8a77006ce578038615189/befopewugikibuxefawapa.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/19374744779.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/tudujibegesiporiroledi.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/regimonurobupiraf.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d578aea9488---refakejifarobimoxibikup.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/92063523401.pdfIn PDF document text
    • http://showdoimovel.com/files/files/57796069809.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/welefifozexudabujatafufa.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/joral.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a598586d0ca---wigajepurebobite.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/78346504720.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/jaxavogifune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=junk+yards+close+to+mePDF 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_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 16476 bytes
SHA-256: 379fcb2c49b0bf9fb28794fca17b46ff524f0c802d3abe00bed5c2cf6cf5420f
font_01_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 10736 bytes
SHA-256: ea3bc5c0356bc74b65eba22b35d6624a23dbe3c9280b24604a2145dd1f12d6c2
font_02_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1