Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27f8cc628aaba15…

MALICIOUS

PDF

120.0 KB Created: 2021-08-07 09:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f6707675339c5020319dd129f4aee4c4 SHA-1: afc6df86ef1b3650b309aea16a41e7361148abfd SHA-256: e27f8cc628aaba15961270b1deac13fc4b198dc211191de6caf4464a5e81c7a7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious link farm designed to evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108619adeb6d---lavigivonagixusemer.pdf In PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/kiwumovozawusevanakumi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cacacc194a0---bejazu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0f1097fd---30127050081.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/48403969400.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p4rc8d599lgviucqkfqkuqkeh3/dapenamekeresitosa.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/861634328.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/tofogekejineguvom.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087abb55ed15---golefelakokadefemenuka.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1nipuuqt3rd12kh2p0i04521pp/60868377365.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfbda670e---60588779264.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ec786d44---25113623764.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8361218b---53749728747.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e46fec8c07---xenupes.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/20463954400.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/31199730479.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/94328954000.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c11bde3e5d---25358578101.pdfIn PDF document text
    • http://martonelektro.hu/files/file/31424256396.pdfIn PDF document text
    • https://ikima.fr/uploads/file/vurenujo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d4ddb400f---19545316965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fox+sports+tv+guide+f1PDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/43d0753db798ac34361c207ac295d04e/25108728052.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_off00016562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16562 25144 bytes
SHA-256: cd3566c339e3690efeda47bda10a0a5d8ab2f7676e58ded24c5764ed12c1f7d0
font_01_sfnt_off0001a180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B997 10656 bytes
SHA-256: dccdeebf1261b2f30f04338fa4b92b42307d2df55d0ea39426a5654811806434

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