Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad61a433148ca6a5…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 18:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02a692ae26a507ace5e5bf654398dccf SHA-1: dc42a0c64366e5e3d6a3514c06cd5117cbef6cc4 SHA-256: ad61a433148ca6a526cd06ce595a007065666687edde4cd82aed4cd630c959ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs hosted on compromised websites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a pattern of using compromised infrastructure for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://debandhelder.nl/ckfinder/userfiles/files/xojisekupupudowulosoxoru.pdf In PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/60147990033.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4753c60dc---sirenozobe.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/4832134785.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/034c65439230d04b3e7561a75940a4a6/ruxonugobe.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841692e290---22284147104.pdfIn PDF document text
    • http://tai-group.com/upload/files/19033131294.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a54fd9010b749da661d619c41a5875ce/sebowofomomeket.pdfIn PDF document text
    • http://devison-matras.com/upload/file/1527638248.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/bfeed7268849e99b3f2142ed84bde641/fijemeripofikedabe.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/lulofar.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a2a886210445dd8ba24436099a2c4371/56135977003.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ac2c9bce91e5cb1435289eaa5b1a68b0/gawomipebukiwago.pdfIn PDF document text
    • https://amblamy.ee/upload/file/18160985072.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/49823829871.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/nevebopejutizikipibedu.pdfIn PDF document text
    • https://cargotavio.ru/files/file/nerifalotujumebutovepajav.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/47896274819.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/pukaxorisunetinipu.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16114ee91bcb8f---rasezinose.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/60857887033.pdfIn PDF document text
    • http://centrons.com/uploaded/file/1399331418610c0e935effb.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713c2075ebd---xejakevixivapovujapo.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ebae8a78b---75744403179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=upsc+book+pdf+file+downloadPDF 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_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 19664 bytes
SHA-256: 3920385421a18ffb43c507f898c138092c6f96a20fd0c9dbc9a18abec1d6fc92
font_01_sfnt_off0001177a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177A 10740 bytes
SHA-256: 6a3665c6dd76aabfc4bcfa3cbc3dff3303ca598c0e5fd12e26b1ddb7250ddb7c
font_02_sfnt_off00013020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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