Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc5d54f1028fd2b…

MALICIOUS

PDF

76.0 KB Created: 2021-07-08 15:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d92e1ada5e2920ceb3a5c8d33f68340 SHA-1: 28cec9e2b07955900556591e682a294ef97cedae SHA-256: 1dc5d54f1028fd2b7d9fc8653031275fee1e54a30672db7d44e83f4020d00984
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/bf8826a0a8b1a83ce0bed4159a1bb6e6/gatesojamivavoxukabi.pdf In PDF document text
    • https://panificiopasticceriabattaglia.it/file/tubunuzez.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81c73ea53b---8090713075.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826b19b997a---29658838938.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/63918314019.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/61710938066.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bf30857b2---kifivaworijemilipinoje.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc6f6dca60---75373916414.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa4f134125---fobadedovezu.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/76670350361.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/selinedubuputud.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/fbc79ea045cbc3202397c17577dd160c/3211943014.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/bajorodovefomitodo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c747d400418---toditanidazoreluvopovosa.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9782c54f---28338331723.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/58385004185.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/89860198159.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/48ec992ca2848309110f228c68676de9/4747817153.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f202b2dca8a10677b746ed150ef1bf61/kafukotefugax.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ih3oukjat28cnjrd91afce6rlq/xezigigi.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/36621723449.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/vuwilibilaw.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/keluvegureparemepomuviwan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=java+check+if+string+contains+only+lettersPDF 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_off0000c17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 17960 bytes
SHA-256: f45b3330d982e5bee6fdd85aa2ec14da47bee6cd82e9f67c3c25e2cb68f13de2
font_02_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 10876 bytes
SHA-256: 427c26729bc0decd0c00c65e4663bf81d7e72469f30992b898913c7e46d33aa7