Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ad1d40b55dcc28…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 14:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9782fd97b5dcb1a13eb9a6f9649e0d3f SHA-1: 6779966e4379e958977b9f2ead67728ab5546e52 SHA-256: 64ad1d40b55dcc284ad91cc65183244244dacce7256619b745ff72bd983941ba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm designed to direct users to malicious PDF files hosted on compromised WordPress sites. The heuristic firings indicate a high likelihood of malicious intent, specifically targeting users through deceptive links. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=present+simple+exercises+upper+intermediate+pdf PDF link annotation
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7fbc70cf5---tireragaw.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/da55d19666b24ddfd801066a8065eafe/68587286899.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/nifoberakarek.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4093f970d8---9105151155.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/55362795168.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608239c5165b4---17910493176.pdfIn PDF document text
    • http://junge-klassik.com/userfiles/file/77676335454.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/40824261346.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/nasokimakov.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/rokibobebe.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/hnh94efhehq83fd80djonn90e3/kuvomivekukegul.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/30163185133.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/lk6pvbcmmp99p5sa5rn694rj13/tuzoveliboponif.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/moduwuludafoxuvaratofesiz.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/orino0v2hmagegbjgeutcis5t7/woxuzulavupepaj.pdfIn PDF document text
    • https://attack.lt/images/files/vutupajavogukas.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080db8f7260a---lilepasiso.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/91c4c658287ce2f9adc3976219d89cdc/lefip.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/65844656711.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/topixovukexuniforoxoni.pdfIn PDF document text
    • http://amdind.com/userfiles/file/33148802619.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081ab63d4b33---nepevefupekuvufu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/riwit.pdfIn PDF document text
    • http://jonesfamilygathering.com/clients/2/28/28a2af4908f4fae7f70f8b91082c1e08/File/34587082070.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160969f2ac9e65---kajatirokur.pdfIn PDF document text
    • http://vanhoadautu.vn/static/uploads/editor/files/37990002676.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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 18084 bytes
SHA-256: 6d6a36ada395ebd659ad0c114afca54e4ae93e8814be0eb7ee7ad10e9190489d
font_01_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12749 10864 bytes
SHA-256: 9ffb2819c88682eada8f5f0ff6f03449ce3cc9ea404eda9889142c8afeccc7f1

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