Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca05558002c2c16…

MALICIOUS

PDF

72.8 KB Created: 2021-09-01 03:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 427f63a8973c2572767cad7dee835128 SHA-1: 3015016c92a85b3be8e5e057368ff73541a1e324 SHA-256: 1ca05558002c2c16933f736cfd593e15ade986ea8f649c820924fa30da5cb2d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.mii.net/wp-content/plugins/super-forms/uploads/php/files/18d5481960fd4500690ef9dd9fda60e7/notipivizujugubifeb.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8060787a---savojamabipakafuzapijaxa.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/61586883889.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/eqndb6h77fn4hnvqtcp48oi80t/kaniruba.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e97b10fc8---95232989884.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/n4bh4pjmioha1ahdafph3f7g86/28952108515.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/804e3a7748e769d199dbdbc66ff03403/vowasefuwidob.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4ce972476702147d1320e17f18269478/kixaguvebesodorutodalok.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8d65dee8b---27534301593.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/95069874496.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/nuwobemiremelaso.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8709ffbb14244851e0899e28c1741a1c/xulozujom.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061515093170554.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/pemavuvakivinar.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1becf76ecbf95ed905971973920f9bc3/87111072333.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/e1a2624bd9d7af9284dbfb4fdf814e03/lefiduv.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/29599829068.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/83551530928.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd50548f4f1---sifazejegawetosogariwip.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210821210540_si6gvz.pdfIn PDF document text
    • https://stopserv.ru/files/file/10255737785.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/67578660997.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c5c73c4ea---35730937685.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/87905936347.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/32742821580.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d4a857b83---88812308668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=simple+words+that+start+with+oPDF 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_off0000bc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC44 10716 bytes
SHA-256: 7253c85dc2d83dfd2d45285147e75cdd72a4017e58bcbc76451fe59505b3862c
font_01_sfnt_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 15764 bytes
SHA-256: 1123cf479c896311c26cf1db99c5bbe04f28f2724942124a3af0954c425ba60b
font_02_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1