Malicious PDF — malware analysis report

Static analysis result for SHA-256 0038346f45469293…

MALICIOUS

PDF

89.3 KB Created: 2021-07-07 13:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4a5ea4900a8bc1d012c07325d911c18c SHA-1: a156528a63ffa24c39316c031f92e450002f7a1e SHA-256: 0038346f454692933898119cab1c157cd014c5b3ef86ae1f5ab0a405257b4309
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a deliberate effort to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://gintaras.cz/userfiles/file/11350305990.pdf In PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abcdfd9cfbb---47081942475.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/9559896045.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/bj88jpgj6q78ts3k492b2sg5em/jovobediwavunora.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8cec3c89c0f88401f4de93c4fd9c64a6/gudesiku.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10747562d---nosirazitexazabuxe.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a32dde9f609---venipamezurazeziso.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080be0a518f4---4641793098.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/41371918292.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbcfb3aacf---wuvapikoseluliledejim.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f1543482a---13813425048.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/34214308476.pdfIn PDF document text
    • https://petek.biz/resimler/files/niwodomis.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fdbd9e59086217de60ba93aa8c25fc09/57130550716.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/waxujopojigarazatogegim.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0947223001622320979.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bb0764e6a---fojevarujeworusibeziz.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/f488c6a3347239385333931101cb630e/milabexomagi.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/bogijoxufabibuwarokebin.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/alb7ajmqtsaqfad1c2l7miaat7/gujaberisumoligej.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/63131752862.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/95c500cec16e80c35c999d77a18008a6/kuronegudoleneterosi.pdfIn PDF document text
    • http://short-story.ru/upload/file/wolozejolobubon.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f26e069bd---74674793733.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/0a91bbe7fcfd25a44e2b01dc0554603a/rovomupudojinopop.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ebc9d057---32192655987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=watch+free+english+movies+online+indiaPDF 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_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 17528 bytes
SHA-256: 7f742a8b7cf02b9ecc8bd9aab5e361ebcf1c0c35ba168ac3c79a383bb4277205
font_01_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 10980 bytes
SHA-256: 982b1a6c53fa0c4347a2922fbb1b9dba1836a3fa289c95a47455ac0ff67857c9
font_02_sfnt_off00013f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1