Malicious PDF — malware analysis report

Static analysis result for SHA-256 12143d51723aa5d1…

MALICIOUS

PDF

94.0 KB Created: 2021-06-28 20:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d051b8ff8078971f6401ca240859dedb SHA-1: 432d1f3babff217e6377b15777e17b7fd7f5c3f6 SHA-256: 12143d51723aa5d1cbc08da55ebb0a692ca75a442c48f0c8373715e31246124f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d3e60fa72---72733593569.pdf In PDF document text
    • http://agro-partner.com/Image/files/zenuforowidifividepuju.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/87686930395.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/61087a1dc1bd5ae3ee02e0405e3bab1c/67717439335.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/69575390454.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a27ff66fd684f509a8250144b8d2ff27/dimejozugej.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/93209174016.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/vogojifovejoravujo.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9bdc66aff3428c0096657b6bb05ffdbe/82319219872.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/puvefifelavor.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3d57838d---47554241533.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6a7e8b3fe52acf3858c589383135146a/sonabexerazesigod.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a9ccbcb53bbc22a932a9bd1b81454a30/61786319662.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b811a87b9af---xekolagitapufolanunex.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/lafowepizaxil.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/fedetiviralow.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22f5e1e37---bazagodupoluzorinulilu.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/vepagewunamizukakedunogo.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/38635355749.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/27002615987.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160799841726c4---dejimujoxumixe.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1622533349.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/fd8f63723d0d8a085739d4cc14979c15/51417448632.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f952ae8fbef6cef0c796b952d84ec7bc/gizelunefepike.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160812c37332c9---66110623610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=prg+airport+arrivalsPDF 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_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 17948 bytes
SHA-256: fa7d26bf9be7899d7f409f727c08b3fca3ad1c6d22e461fef12983be26f75234
font_01_sfnt_off00013b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15398 10256 bytes
SHA-256: 6deed0b25509d8ee077bd2e7a769a66c938a5b423ba499503dd5e4392f50cc50