Malicious PDF — malware analysis report

Static analysis result for SHA-256 91490cfe6d2608aa…

MALICIOUS

PDF

100.6 KB Created: 2021-08-17 04:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e46da121195691baf5365a086342726a SHA-1: 20fd96f9c2248d1e078d8b3975c5a467718ef524 SHA-256: 91490cfe6d2608aa1cf1a66fe4a5073e7079a53865f8c23a1e6db24984e6ca88
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm pointing to compromised CMS uploads. The presence of a security bypass instruction and numerous links to potentially malicious PDF files hosted on various domains strongly suggests a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious workflow designed to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://firmykominkowe.pl/Obrazki/edytor/file/wotodefofujimirikoxir.pdf In PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d000b58cc---83322021626.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/873b17f69864b89dd87b5218d736d58c/ramemevagilikik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc05d1b0e---43387144243.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/mofiwenesariwinumafofis.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/1a5un19c20o1vlhnnscvp54i8u/ninovapejixojuxodume.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da2899ff9---2676456687.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/pabajelepokijo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160978dc90ba00---dakapetukurojazopewexiler.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ea2b1d423addd4fe11c944cded930635/99725211634.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/25681991433.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/zonesutigegakotaw.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/76639760349.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/27226044182.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/57d572f65de15259f4dea353039c8276/xukibetevowawedu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b92d9c0922c83015700ed06cc6b17bd5/sofunotazilejofilibizur.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/69920888701.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/rrlqloag3cjpb2ijptnnkpjah1/mesuxulutekel.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6de6c8190e---12027484159.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210627032054_m1xik5.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/dezoxiwazubituzi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/862e5ac87a23774c55cc12a127e91be5/56227333009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+play+ori+and+the+blind+forest+on+macPDF 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_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 11216 bytes
SHA-256: a4c8333c83dfc95ef6f3f98cb7b6d8c5a3a3317c001372cc31306606c074898f
font_01_sfnt_off00013aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B2 17912 bytes
SHA-256: 7a058e025108fee55a36f593927c5d58a22fe7c9431c5802ec96fa6b494a71ea

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