Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a8ed2c0bb037bc…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 03:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b3ace3e7b95278fefd5b9e4ecba963d SHA-1: 4ec841a08dae7e79404040baf4396485ec963b65 SHA-256: 23a8ed2c0bb037bc70d30fdc71d9d4aff17c36370b67ee2502a0f8c4a667e1e4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious websites, aligning with phishing or SEO-based malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://mya1fc.com/files/ckuploads/files/39921153453.pdf In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f858fbfb43---84640794514.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/017f16773361e3188b350d303c886f85/75481344382.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210708050834084207b36p5g.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210809014137.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-2/20210702115104683953.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/477467f4ec0427cb3109fa2153673ea9/kefaviv.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1d8978ab7---zigenas.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/00acf7646e95c0581c772f16144e32e7/48427076154.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/99419352753.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/64067458238.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///48454087618.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16124d3d4a705d---fesodotonivizidoxuxuf.pdfIn PDF document text
    • https://avenue102.com/uploads/file/setipumuru.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/waxurakoxuxerudaw.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6bcc7a705---xerosetezaxujaxugixub.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/nabetepalu.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210604_2E967A967C5AD572.pdfIn PDF document text
    • http://benly-carson.com/product/files/zobilopunirasebozisazifog.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/vn4p73mp5bpr7q433sj8c7a6u9/netodowenafifavoxeve.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/gatodawusarifed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=matrix+relapse+prevention+worksheetsPDF 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_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 10688 bytes
SHA-256: aac8581021bbe7ac443909877221bdf33e6d0cfe5b29853138723b1d2f132dab
font_01_sfnt_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 18364 bytes
SHA-256: 947aa1ab4b371a1e15022f6b191f9114ec99f97e7d7c7b1fddf5151b05907136
font_02_sfnt_off00013430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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