Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1bc5c7186e8614…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 04:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc088a7be32a41872fa1176529fd61b7 SHA-1: 4b6031f5e1ca11b5955756a86970518073982ffa SHA-256: 0a1bc5c7186e8614fda3f124419c0f4687a50ae9ee9f98d245fa3d4957c020c2
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links pointing to domains that appear to be part of a link farm, with several hosted on compromised CMS upload directories or disposable hosting. The presence of a 'download' button lure further suggests a malicious intent to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://agentcctv.com/userfiles/file/34858213328.pdf In PDF document text
    • http://biolabsrl.org/userfiles/files/vunonu.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/xewesogafifeliveje.pdfIn PDF document text
    • http://ge-mak.com/files/texijeja.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/49818668432.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094052679478---simikobaduvaxabixegeli.pdfIn PDF document text
    • http://dgjst.com/upfile/file/75430791718.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/kamojagisabuvuvimagira.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082578d29c44---83938407868.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fbf925cca---zifadati.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/2304435863.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/vphjngtf00ksdah279mjmont63/2972161332.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/tebej.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/36950819352.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/kutetolu.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202108100934047585.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/41536427656.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021080417233495.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/sr32gp9743nbmduf5qsm8foek0/nudexewonusa.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/98071316275.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/40817334549.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d115d3c1da---90404579420.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/e74f083a87a5f1f6627948920cacfc65/21425213683.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ebdde4f5aa32ead3e7fed02b50d86015/17748968823.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fogedisixototifu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607322cf89262---48896583024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=prarthana+pothi+pdfPDF 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_off0000c4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 17456 bytes
SHA-256: 2a888fc342d0908263681d53b9f6ea5ba28b791c794b086eb98bbd23fdeec23e
font_02_sfnt_off000109bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 10248 bytes
SHA-256: 0916f3bad95a806bb20c774e5af108c8323e4c07f067a6b63a0305845dbd41f0

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