Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfe4d5528c94f32…

MALICIOUS

PDF

83.2 KB Created: 2021-08-25 17:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd657b95f8b4a33d0074f2033f1a4116 SHA-1: 5386ba79c4a1c0d7b3a6e7f6079b799908ecd25f SHA-256: 6dfe4d5528c94f321d9eb90032d909c150df4a772f2489f82bcf13c09d7ce53b
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://penmypoem.com/new/admin/uploadfiles/file/joxuzoxamekexewok.pdf In PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7626ee38421d8053fb53890cc3e15353/15612550836.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/43152757126.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2ea3721499775b3f2c295461e4334e59/jotusupotarolojeligel.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084c463b8c50---lamevijoledimasidewijuru.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/rupumovizodu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae3a49576f---25629721212.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/dotonatunizovonomiwew.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16078de30402c6---sodogomapawudopusulifi.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/36517167503.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c652dcd87---45979788342.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/zuzubegozuzafarevinova.pdfIn PDF document text
    • http://kesifveotesi.com/files/83281316639.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/n4ujmsfchqegti4g5gs5tltj26/jexekefesadejag.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210808021242_j3bcha.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/nizubedunuxodo.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///82249686001.pdfIn PDF document text
    • https://estoniapools.com/contents//files/tugirubujomozowetiwa.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/kivotijovelutuboguwikok.pdfIn PDF document text
    • http://gewald.ru/content/Files/59998566659.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/gigodujunatimib.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/2108092243546802120gimcb3fnz32.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/kafobidaguvolufiwoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+print+pdf+in+booklet+formPDF 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_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 17324 bytes
SHA-256: 1e13d052454089a29686efc910cd1c73318253f2c63c015765efa8d5b91f8eff
font_02_sfnt_off000126c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C5 10636 bytes
SHA-256: ec3b1c6003ea62620ebec8feb403bfda1807a756489650afb2700ad2f02475a8

Open this report in the interactive analyzer, or submit your own file for analysis.