Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f51fcde71181d8…

MALICIOUS

PDF

87.2 KB Created: 2021-08-15 00:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4375a5d19a6c4a5a610835b041d550de SHA-1: 36e36dd37503eeb40ea0fd659c4ac60f408fc3cf SHA-256: 62f51fcde71181d82f296da89c41b70fcb29fb7380a1d4ee89ef0ffd89eb1369
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://podiummagazinenews.com/ckfinder/userfiles/files/8391054478.pdf In PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b49950002f2d6475b6ea34d1344b7b9b/12744568661.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///suwazuzedom.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/28357455385.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/98971908102.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f005173689---84582923861.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d50524e846104a2927a7cd6bc9c7eb9e/zafozujo.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/kasavoxivavaluzetavapat.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/82455493b7f6ff1efa6ccdb060d3afee/logekij.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/povivimozatedobafikel.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e552bb95c4---59148794793.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7e69e6297f993ae61926922f74372d02/39855118525.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/49463075403.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/27690037787.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/15541194625.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/duturera.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/juneti.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/8003f43061a175028f7a9f39ab2cf778/1493359400.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/12892149228.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12b8813b3---wolazisobosalazegoxe.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/s25qqjvvifqdffbs279nuplj8e/xuvasufafaguzowi.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/wokenivixoruf.pdfIn PDF document text
    • http://mcutech.net/files/93841075823.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/501cd6744dc28f931e0d236db2078165/zojuvofakagejog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=full+hd+movies+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_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 10488 bytes
SHA-256: 637ee4679f16df40df40df46fc0ab71a5ab33754632c1401a5b818484cf40a5d
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 18220 bytes
SHA-256: 2511deb62824e20730cf0074dd209c1d45a194714054f6485ba9a8367bc65827

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