Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50e93be15446764…

MALICIOUS

PDF

84.9 KB Created: 2021-06-29 01:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 587be55784b0907d81ea60fc77548243 SHA-1: 26d9fba69e96817caa2416158168e9ce0e4915f1 SHA-256: c50e93be15446764419d7a88d64ce4a7c8d0adfc2f790fa017907d8835732e6e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to potentially compromised websites and disposable hosting. The presence of external URIs and link farms on compromised CMS uploads suggests an attempt to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://oniceh.ru/uplcv?utm_term=yahoo+answers+points PDF link annotation
    • https://fertilizergranulatorprice.com/d/files/jufaju.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80a4324abdd2232744818d32ae50de3e/sevodevamefo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/83576c105fdf9b6228dde838aed3809a/jefozejezuvunananep.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/22115720796.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/monorogom.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/7184115888.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/wabikaf.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dd20e911d---puzugimadujarumodadapesa.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084898cb3fdb---vifixedogu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e39c9c8687---86279777781.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/aad3368b06410d0f1820c9061653dc77/20696739661.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078299827d30---47683852639.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c635b35143c---37068325495.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/44021933504.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d410b9c1ee492f8f20ddbe1a29940aeb/kufasavupopudefusamizenar.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/268dqpv5utncdh3t6bclhuppi0/48228448739.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/15103764343.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/35641270880.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08bde43f46---fajebozekixoritixapukesag.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b31d608f11943f57721b08c135892672/nadorederolaxijax.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/kopev.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607668758a20f---telorimiputomotiwa.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210504142752101.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/kcacst9t911cl7i1h2ac6t5386/43615400559.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_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 17104 bytes
SHA-256: 59346a5dfe6e55f9211282e3584a0b57f883e3d7344fe356b5e53af86bedffaf
font_01_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 10372 bytes
SHA-256: ba52cea8f46472057eadc071c07f5df0e05b1c815647730d604e0a5b94af797f
font_02_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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