Malicious PDF — malware analysis report

Static analysis result for SHA-256 160d2b73da70135b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 22:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc661881758e5d587c6fb4ca3332643b SHA-1: 7d5521c1059a1cbe883f1ef9597a0863b59d5cfd SHA-256: 160d2b73da70135bae3abe5dfcc72b81abb7b7a22d65d4663d9b012545253fb9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of an AcroForm button with an action trigger further indicates an attempt to initiate user interaction that could lead to compromise. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://drafthe.ru/uplcv?utm_term=free+printable+worksheets+reading+comprehension PDF link annotation
    • http://luingpyrex.cz/foto/Image/file/buxukagijef.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/160b89ba59c9b0b7be0f0f37ea540aa1/47031774819.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/e51366577d64079ed503dac702eef115/80158644077.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/resales.pdfIn PDF document text
    • http://halanmilk.com/upload/files/guxelu.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/24362255685.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210612_5D6FB25AAF90293D.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/9j75qcccf7g90dg739lmc0je7r/89672653603.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c080f06748c---favopemixesaseniteravosej.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb320209a0e---56315182896.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b919841a994---bagire.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/28135194170.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4ea8e600---tisaloxasi.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/8rmrfqs2v0sqadpua7ul1e4mnp/niriraxujufifitak.pdfIn PDF document text
    • https://petikdaun.com/contents//files/61677266069.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/48441673562.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/832dc8e4b28b043104299a02e01459ee/rupivuzofevup.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/2615453442.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/8drp5ivs4ksv56jv3dp5o4rk3s/vofefemukabagituz.pdfIn PDF document text
    • http://abnicum.ru/files/file/zubixefinugunol.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a3d22c391---67975434375.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fcbe3198003---tirufug.pdfIn PDF document text
    • https://digireg.es/upload/kijodixek.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2a2a7ce5b---66516700974.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/29388544643.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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 18128 bytes
SHA-256: 81070bb9d94428d0623705066aa25c6c3fc36de370ddbf5c92778dbc7f2beb51
font_01_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 11256 bytes
SHA-256: 7c7cabbc98cbfceb74ddc8fcea471d32fabe2c7dd2d6f5d79efbf9af8193a460
font_02_sfnt_off00012825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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