Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f0b65d5515b56b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 07:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe9cdefde7035e8632b673ffce4ab5ca SHA-1: 8cb8b08e3b1d1713695f67f1e8c853efad0557ca SHA-256: d0f0b65d5515b56b9cd41de064105fab5b391f41604cadf45812783f59854bf9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. It contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a8795bfd---83496983913.pdf In PDF document text
    • http://kadh.kr/bobod/upload/file/mefazobozipuje.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76bbf62933---xujuzedav.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/komidolejosuzifexovop.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xonewavikufokedonanejajiz.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0754bc54a---55071048753.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e15f6e7505---65596614561.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/posamutozebijep.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/u03cein98u894dmdnqm50ingt6/xesawotuloxaxofoxi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3oor38ru34n7uqb59lbik3o7t4/zujoninavolopovojedegeveb.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc864c524c---kubamonuzuzejo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9a797ee2793020a00c7c140e0158bb35/zufin.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2775d9be6a---79670631509.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/2990be0093ff9578cb3d109c7dcc135a/49851323585.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160712b2423d5b---30100816304.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/2d8epok1dp0frp6d0jk0m5oihu/84899798793.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/xikoletigo.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/203d2c09b8da2302a96e5e3ad5eb5eb4/zaxuf.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vlfgrauh8mk8t9uhlh39803kv3/tomusomajarimur.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/basirirat.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/39654079982.pdfIn PDF document text
    • https://activepymes.com/pub/file/liluvusuvomeforuposep.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/17410143197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+pull+station+pricePDF 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_off0000cc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 18124 bytes
SHA-256: 2e8534f32ce8590c0074882f175f8a15a9ad525152836cb1450f4df4d2432c47
font_02_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 10460 bytes
SHA-256: 4877f35110f337b22c9a8c45dd4e3c78b1f9c655a10c01f72003e555eab268c4

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