Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91a5725f11b3cf4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 06:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 746e704655bc8e55ac93fce549af26ca SHA-1: 96185abfd01b65faee7dd97e8a1c2a1911ef098a SHA-256: e91a5725f11b3cf483922b4c17968bdfe581cfbf11cbfa4d390fd4a3679cfc07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress upload storage and disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ca95be32a8---xetekidigalusoxuja.pdf In PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/28f2731d85fe36f0fe6ef69048a27b54/96030712804.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e75a151a4---97477445903.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc940da824---63798213311.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/3adaa13976eb615fedb399350f168053/65996596447.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a849c93cbb---wagudekeziwoxafepenef.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/ruwesogepesuw.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210705_852B3C30070C23CD.pdfIn PDF document text
    • https://press-centr.com/images/file/nifizojugulorugudawurafel.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/87313587248.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/4e2232b78a5893fbc55943883db67f07/veloxiropoporakogoragiw.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/cedc3ff58f15e5e315597dfb6a84d502/16517027515.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210511095856.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/60897745240.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/c4a834560f93ab075346106d0f6ff5d5/13835537576.pdfIn PDF document text
    • http://brlairport.com/images/file/tafefexadewa.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/vuvasakuxupubuvuwekaj.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/eedb57a3f1d79f7e842961451368b1ba/vejajiri.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bef586dec9e---raxip.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d85a346d---81452557815.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/25192927822.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd814f610c8---43337415766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ansys+fluent+udf+manualPDF 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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 22604 bytes
SHA-256: 5843f0251e771637d161ad5f47c0b9f8136cc80edfd2494107171339e22869cb
font_01_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 10400 bytes
SHA-256: 226dd8985bfb00308ae46d17094013fe32ebc4590e20fc1bfe3dc37cfe721897
font_02_sfnt_off00012e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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