Malicious PDF — malware analysis report

Static analysis result for SHA-256 356cc57290043eee…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 00:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32f43bd95bdca8e756f05af0ab2fd336 SHA-1: 888c8a7dbc5c1c68c3d9baaf693906ba7f308ed8 SHA-256: 356cc57290043eee813bec082858ffde5484ebcc887d09527d7f87a8c4a2ff09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://abwalabamaave.com/uploads/files/26355955083.pdf In PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca85e6b5a---59865557285.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608683a62cf35---81663148869.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5fe03beef---zotemuxoxavadigufasa.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/30372875059.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/felolozuxero.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/98698109885.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/95918554757.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/17965996075.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/17e3dbf0635d986fcafc036aa543fd1c/nanomenisuwiweminis.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/negatelobumumapirix.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a1113ff71a71f1b271e615cb63b958db/wibofodijogit.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed56ab410f---muluzaxewupidanasitojiri.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ul4bipijvagam50gqc97j1cldb/16107082540.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612006441dbc9---44996470287.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/73744554311.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af70f28ce5c---49117340201.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6d38db53ea32f161c843fc48e02a2dd0/fuvabave.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/zizug.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/kplh5co1lpmus7csjjao26m0k3/gasosimurepafizikolulul.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/fifafufajidegesitefalu.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/rasixesasufididum.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3de20f84f565818f6c8ac60827b14837/wasotuw.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/walakex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mount+hope+cemetaryPDF 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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 18572 bytes
SHA-256: 245eb45a9eefe96ee0209140fd489ce858b216ae7ce75cdb6d1988640c5bd8e8
font_01_sfnt_off000111f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F7 10540 bytes
SHA-256: c00b413dd02098c2cdbaee0ec7b2ac6b0ac367f8ed35b4e2503a9d06e57ba791
font_02_sfnt_off000129d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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