Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06877f56668bed1…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 03:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c8efa3376c692817217bdeb35f07aca SHA-1: df61df95350ae3166ea6692f63fdae170d641adb SHA-256: b06877f56668bed139578eb06cb89d66a0199dd1c658337ffef7fb7d6acc3c35
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various domains, some of which appear to be compromised WordPress uploads. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=photoshop+3d+tutorial+pdf', suggest a lure to download or view content, potentially leading to credential theft or further malware. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://queure.ru/uplcv?utm_term=photoshop+3d+tutorial+pdf PDF link annotation
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/barasofalofomalejifaken.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/xetavoki.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/86722803996.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/zopemo.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/gegotavevonakaleke.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/67858228291.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/malozopulekijegogoleno.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/wutob.pdfIn PDF document text
    • https://zhansq.cn/upload/file/39029308351.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/mifimolobumodadozugot.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee72e77dcf---vipegigulutu.pdfIn PDF document text
    • http://proxima-design.cz/files/file/nubidu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137ddbbfae---jenavanojejumirilojesuw.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/13097677150.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/fakiditamomesezuseko.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/babupe.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/jipefubaxatatazifevem.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2c697b59---88337218163.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/qg84nu0jjd0of4u3j33msfeec4/mezufukor.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/lakilagitumojazi.pdfIn PDF document text
    • http://huntland.hu/upload/file/44039596229.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/xajusupuregerumotufakade.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/webefade.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/60709369373.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/zofisogituvimikib.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/tugonebaw.pdfIn PDF document text
    • 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_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 17012 bytes
SHA-256: fc0e8f4c4a69256bf2d21bfdca78250e11379e6a6fd8171e9b0e6a0fafbcd110
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 10632 bytes
SHA-256: 1b6f967f6336143706ceba6f2f3d4be06f34052606c82b7f7747a33ac93a4946

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