Malicious PDF — malware analysis report

Static analysis result for SHA-256 59300f2e97a9af69…

MALICIOUS

PDF

121.4 KB Created: 2021-06-28 15:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 67ead6b2356ff2f7d3b8b32d5d540970 SHA-1: 7719c76c2df82d984fbd2a0eec6fa845495963ee SHA-256: 59300f2e97a9af69bbe3847dc2dcac8858eb5b1376d0f81d3b8cecd843904a39
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/0054af86d527cc61f8d343a612bcaaea/neziwuribosob.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6oeqts2lvtqv0fmv9eg30orpm5/nuvixiruxevimetuxefapil.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8a655b3b3---18573028230.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/933dau2knt0ip990t9ovnegeub/99480995299.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/dtg2ddfi8qvih2c6uln0bpim69/risazoragefiloguvadujasux.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/wegexizexes.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091d207cdc9e---84414123153.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/2d37d41703958a4d741632e8042dbb29/38675660374.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5efd4b9b---77417503804.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/5f3285131757d0988723093a7ecb83d1/memigotugizugenibabo.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/domuwezaxezufakuzazeg.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/apkdbla9nebspb0kukccbupnu3/mibituzanoxatawanewuwip.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d137a1c5a4c4efedb6c51b40bb61cca4/wekijuxazo.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/0d0709d19ab0898ad5b015dbcbdfa994/65840025621.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd7c68364---noduv.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794ab0038c3---91756186277.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef80d41e8---lazakobukewojufaxoturisop.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/lizefamizozinunepefigewe.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/pibizile.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/278c4994974e93a74c6550e27d3080eb/xafojarezijagelab.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fonorepukazipofakipo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10245b4b73---35114083253.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/38886812588.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501121540748264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=box+with+check+symbolPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 10716 bytes
SHA-256: 9a2e3ec2b93f89dd927d2d21dae5805f72855a91f5ac67d2eb6ade92ad744165
font_01_sfnt_off000111f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F9 1872 bytes
SHA-256: 6e63ded414000cf0c2cbcf72e150d5c6c12bec7ebb2b129da9e0b61d7e6fd72b
font_02_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 32476 bytes
SHA-256: b0bc745bafba72b6192bb69708dd9fefa7b2a5213eec2c36fd1884abfb113b5b
font_03_sfnt_off0001612c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1612C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001793e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1793E 38940 bytes
SHA-256: 5d656093c825de5ab300a7938caee6ff79a016e22446bd210afb26eccf3ebfea

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