Malicious PDF — malware analysis report

Static analysis result for SHA-256 284066719821e0d7…

MALICIOUS

PDF

117.9 KB Created: 2021-08-09 21:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8d6ddbedebfcc08907948580d2006fbd SHA-1: 176689baede77d3c2d4908c8d9179090f0cc7132 SHA-256: 284066719821e0d7057b240f405959a8a3c86fee0fb951e7e11a957f7827ef8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of hosting potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866f351bbce---raluzofalegazakavefewaz.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608912859a157---91703938741.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/gibowiledirupobagaf.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495b197197---basosasenezu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160878597753b8---rewowumunedofusipasiper.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/3a166c7bcceb5ae03321f72dd94443ef/zozosel.pdfIn PDF document text
    • http://goldmustang.com/files/files/gemanozanin.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/589ce852329346a566e277025f787cf1/vuwulunefepasoke.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cb402b4f10b7c85dd1d378b7d734097e/38141876788.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc295ebddc0---68091015375.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/85b91a041ae4efb874b9386b0d6582c6/98344434112.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b8dd46f1d9819ef40f12f4961aa1cea9/17544706002.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/43662141243.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/14212ee6cc56e353e20d556faeac0e11/99050536590.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/fawovaxarixikutufidodasif.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/zakobizojewarudulatedir.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad197a7487---soxibekejisisedelinijarew.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/19900754508.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kubrt3vqct410uhad1jkldja70/26550170934.pdfIn PDF document text
    • http://valeneighbors.com/userimages/lefojeraletimafe.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/ed7jv7th58i3avviutairse761/butovage.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160797d30618c7---79293941460.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/43702821430.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/virewon.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/dasimuxeboxiver.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/mudovezevipuzov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=has+missing+2+year+old+been+foundPDF link annotation
    • 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_off00016cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD9 19056 bytes
SHA-256: d20fc66f39531ce56087e0587876344e386574062b2b770aebc2ebb9567b617e
font_01_sfnt_off00019e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E9B 11064 bytes
SHA-256: 066af5db559fffd90a02722f76a2ee724ea68a423e0f9089a1370ee51ec58fda
font_02_sfnt_off0001b81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B81F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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