Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f139d9bfa808b10…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 14:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42ff2f1df9067654a204a87f1ecbac61 SHA-1: 6c648056543b8db49d625abd1a61518a17333ea9 SHA-256: 9f139d9bfa808b10919f3c2f00c3f04fdaf50fabe9d7899a3d7ea03917b424cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious sites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb16496827---ruvigemufuz.pdf
    • http://kme-kme.cz/files/file/botomosobinumerototufokif.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080773203c41---meronopowipinogi.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5ntljac7saulenaspmg6hsmqm6/46061597848.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac039358d1b---74656126859.pdf
    • https://apsco.ly/userfiles/files/viranedeporila.pdf
    • http://pronobile.de/catalog/file/4291612677.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cko6k9o1cgfeba0fg95kmgcqm1/86710064521.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a207da626---xuwevagixamikagig.pdf
    • http://lnshiyue.com/userfiles/file/20210525050816_2114691678.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6834bf64e3ba8a6e1cda535452ca3f09/tunajalesexowenuv.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/3b1e2005a2acd144a1d5a947bdf2d8d4/58816114371.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c192be7dee---sineg.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c920f09d342---zibuvakoxexiku.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b27d6c296---giwemisetapaveruz.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/25100079017.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7eee8d69f258179c997c00ec64c9e200/lusut.pdf
    • http://kimkhimientrung.com/uploads/image/files/walefifibafovanekuvakajad.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/4b629a204e5b81e39f3edcb51cf25d20/wamefatogafowutukixi.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b7f881d9b---91942584443.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=app+to+delete+duplicate+photos+on+iphone
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ce12527cd2c57f50fe9a2be690d07e3c/mimodijatur.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcf4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 16792 bytes
font_01_sfnt_off00011506.bin
966dc51b03153678a962389229b2e6793365800b03f163acc4ea3c24b77a714d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 16888 bytes
font_02_sfnt_off00014120.bin
9b9cc311cd3da6a99390ee43c505420689dde83e48b9105d1fb7a86fb1533e00
pdf-font-stream PDF embedded font (sfnt) at offset 0x14120 10592 bytes