Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58eed2b0705c71a…

MALICIOUS

PDF

83.7 KB Created: 2021-06-26 18:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 42ed1f2c4370129ed0f56e8525ee83fc SHA-1: a8ebac4444e8184609781ec4c3f48d0187af3556 SHA-256: d58eed2b0705c71a7cbe22c557eee6dbdee6b7f12bd8f215e7848b972ddd6d32
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The presence of multiple links on potentially compromised infrastructure supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/lenamubugivapupo.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/bkfb30k84k4hfrrct86ngo87u3/85256603505.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a9063eb56f40980bb334a73b938ec075/21850484769.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/bodamusijukoxoximazut.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091c362d7d7e---38582393374.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/silodiloreneziri.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/xazefip.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a92699399---levaju.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc6c6da47c---29608447856.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/40338aa10c9bfaed0e1bea9fd6c2452b/jovelaxotupisi.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160860f9beb59b---17869696570.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907f92c1aeb---pesez.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/gividogimodimofawenidom.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd668ab180---6745526693.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/64466297433.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7019524c0b---daritejelezatexakox.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839f116e6c3---17753415110.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16091af9f4eb19---81099520868.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/tepari.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/6blbalmac7gg5or8adj2vgmdn4/wibomijov.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/m4jncu9a7kapsktr5e3bvmp7fr/50740806456.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b964822816---nomirolujivexuwigitedel.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/zugonegedasitojaxorajatew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=first+law+of+motion+in+shortPDF 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_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 10408 bytes
SHA-256: 7ab33332560a57226d06dd45a23e42c991dd2dc7e6f85949d37862513975fd1e
font_02_sfnt_off000113c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 16860 bytes
SHA-256: 3814974b436a5990ae4de7753c15c4aecf1bb36b33a5f9a6e3962ef05c94eb7d

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