Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76a588629d7abc1…

MALICIOUS

PDF

87.9 KB Created: 2021-08-05 14:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 87790491ec94e329680935709a9fa30c SHA-1: 2d9faf5c7390a4704d4c975cf6d64d8c055f970e SHA-256: e76a588629d7abc1a25eca77e520a985f554bdcacb952f1aad42d7e0586288f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://garglob.ru/uplcv?utm_term=an+introduction+to+the+theory+of+aeroelasticity+pdf PDF link annotation
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vh4r4m1pa21djukd13koauhev1/72310350594.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216121823122997.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/66352038814.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/52479158960.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5bfaf7bd2d---46098235156.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/39542793307.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/86746909032.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/505d85209b65628807de9eae5a682fca/fiziwaren.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210715_1AB95FCE0464C5A4.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084855137058---49032325440.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f1fad0b73---luxidijikotipatosab.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/06f75d4cb7d46e4d95f82dd88ab86490/6162026177.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/46476014507.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/59cpfk3tl6pprkvfq500lbkof6/79944511285.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd4ad8e2d---61063641679.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/47100425077.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/86312122583.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/dcsnk4b7fdj11r77hnduh8s95j/disepijinepimakulotaxelo.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a972d3ed30710c2b1bb1e2b0bf3eed46/95840455962.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/552158f7e97e6ffc0c418c1355db1cdf/zupatapanodajosarigizos.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/74016149954.pdfIn PDF document text
    • http://change4best.ru/upload/file/jukalisawon.pdfIn PDF document text
    • https://rinducm1.com/contents//files/joxadudoxomujunofosaza.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/jovamukevikujifowifi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 17688 bytes
SHA-256: 351cfe4823997ce47e13c2132f70e09952be069c02ec7592e39737492a81fef2
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 16120 bytes
SHA-256: 5a58bd25086e93d985c75a25ed67f4dca879ce5f42e3fed3a71b5bf37e4b09db
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 10912 bytes
SHA-256: 6f49a84919631ea111b89984385d81b03361e5aeee0f4af8f73f8e098469ed87
font_03_sfnt_off000137a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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