Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa96fa579ba2c53…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 08:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6c4fc0ab21ce984ea2fd62dd3bc35fb SHA-1: 0375cd0fc5119441241b5357a840c2777065f603 SHA-256: 1fa96fa579ba2c53ed1bcb1839164a6e2f2f0fa535fb418edcb2a42220472ed8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm with numerous URLs pointing to compromised CMS upload directories. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests an attempt to redirect the user to external content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=how+to+pronounce+the+word+live PDF link annotation
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd118379d0---lipebe.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/476225ec4abb76a6a139bcf57f828074/80227022487.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/6c5cae27073fb01a8ec08e95c144b40a/14483781406.pdfIn PDF document text
    • http://talleresjpg.es/img/file/28014525266.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/80571778850.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/85534014277.pdfIn PDF document text
    • http://consade.com/userfiles/file/burujux.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fc5ec99c63500eaad37fc94b77d0abf3/siliroguxanupodaxumuzo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a62736f6---27253307361.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/zibiwi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/83523956575.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/3bee2c0999af88b167fd1bb7542b4942/wamulaxifegif.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/93383430120.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b149bbe0ed8---falawudisisudis.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/14095465914.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/8bba6c7f3dd54dc40b622778f3a447a3/volivebuwarezexerefebo.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f6b3a4dc93d2e1d12c0e87f3b03b7d94/nulamunil.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097dceeccd00---fanidojajaxizi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa0ea11a9---lotabekategarite.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/329231225618b9059bc527535c7fde6d/jigerozan.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/julilopedez.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/80600697548.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/abf2e331739b651934956b6a9c38a149/gopiwa.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/89024760715.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/24616574763.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_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 10524 bytes
SHA-256: 6202004270ec34af942326f9e4c965f3bba94ce4df5c3a916fe4e17e994a425f
font_01_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 17848 bytes
SHA-256: eb68c1f1b68a35f9f1b72fa1c80a33733c31ddb4e3f61d77e4b7ca38bcb8b868
font_02_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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