Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8f62a10e37eba2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 04:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3d29f7346c45ea5637bb8ac0dadae4d SHA-1: e598bc7b5fb45d7c0f0ef247fdbc0d4a2da4146a SHA-256: 5e8f62a10e37eba28853e8b08f953ed54876bc77f054fae46e88a3d6e868f59b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://csc025.com/userfiles/file/20210823151313_cd33k8.pdf In PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/72559301422.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607548d230818---gofasasopilebolutixategiv.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1fbf6aa60---89732996200.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1b071debf7e90b68917aa216bf2c0a6b/xuvinuxujosazubamisezop.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/voxapunuganidevegusozevu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2c09a416285b29de99d5f381f06a8638/3431823535.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f770a991f---37883269460.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/guop3r565jhkih51vtbqkab517/kebitu.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/cfab742b8cbcbe148b1706c326395436/xenujavelanutukusuxi.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/4603187748.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/besina.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/givezumegemodugarasinipu.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/24544831635.pdfIn PDF document text
    • https://elektrona.cz/files/file/41512278015.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d401df54e47---78296492465.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61961865170.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/40025ef601967b0727eaf2061038c01b/pezizebodezimozudaki.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/soniguwikoduvozuwu.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/54208223537.pdfIn PDF document text
    • https://petek.biz/resimler/files/58604311317.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec43976f0d9---gajonanipepusipebabexud.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/monikiridunada.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/dokuzigog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=virgo+and+aries+compatibility+2021PDF 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_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 11376 bytes
SHA-256: 7c2c0223ee4cbaa7d598b9e3f360f46cb54c0e2cc303206798f302bac1d1a5d1
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 17980 bytes
SHA-256: 85fb9780a87c27956496aa7d9e16488e0694772015382c02b8009f15121728f5

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