Malicious PDF — malware analysis report

Static analysis result for SHA-256 38687f5d18b5a49b…

MALICIOUS

PDF

83.9 KB Created: 2021-06-11 04:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d805c8bea749dab02d86339ae025a6d SHA-1: 6bd66ed67166c4ebb5807e1876fddab9a8dd635c SHA-256: 38687f5d18b5a49b7423b70bf928b24865294616bf1a327c4d08e48d94dc90d6
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document exhibits characteristics of an advance-fee scam and a remote-support tool lure, aiming to deceive users into downloading further malicious content. The document contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised or disposable domains, suggesting an attempt to distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://inwebjor.ru/uplcv?utm_term=java+oop+exercises+with+solutions+pdf
    • https://33mobility.net/uploads/files/foduneja.pdf
    • http://simonide.org/userfiles/file/razisekaxeziwa.pdf
    • http://staropolski.net/Upload/file/bosurobuzudokudalumivavoz.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/6072d6bb5bda180ac2ab545ab320af96/movizutemesumoxaniseboza.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e19b0e83e---kobipo.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5c283a66fe39090ab8fdf0758933e6b4/lisagolimofafalikemumewe.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085614286349---14879407115.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea0695355---48363771830.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/921d050f3694aac2e814da3e35803c74/63102918390.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608119373db40---vuzegonaxisabuled.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3026e0aad6---96067025960.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/15e532636334da6e1d676698d79bd1c5/21382209959.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16085beb13479e---92991474721.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c3e08348d34e9cb95aeafb5ee189b32e/43155537864.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/4brcjpt16meuvlj0i54ielnee6/7080438305.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffa3.bin
d1751551d761c01a85907426ecb85995e94c6c92b67a39e34eecacb63f893f9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 5452 bytes
font_01_sfnt_off0001123e.bin
66e81e517178bcebefec905caa511b6adb8aa2af85751669903c4bf048bb8e1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 2208 bytes
font_02_sfnt_off00011bae.bin
321535d68b8c7b81f573d062aead7075fb09efb9a3c99902bdf656664940ab53
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 11344 bytes