Malicious PDF — malware analysis report

Static analysis result for SHA-256 d843b5f7a99fedd3…

MALICIOUS

PDF

90.5 KB Created: 2021-06-26 19:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4381310d02fb098311a3c395509c200b SHA-1: 085a8c5f4ae41c9ebbcba3430de31b83f51164f6 SHA-256: d843b5f7a99fedd38e5d125fee58fc2ec8d4460d75d083de65abbb0a8b3d82c1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links and the use of UTM parameters suggest an effort to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/16ff5a6799dfb81e674e04014634bcd2/39925809257.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/aa5b71ae8ccc7aa9b73f5f58b4d72e4d/tufematelujureb.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/14916249680.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cacd65c5b---bemezij.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ae6cd975---gekolatoluderumeponirive.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501134205884975.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/24288072058.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/140a3fff8f27f58f0ffaeb909648c8a9/77222585064.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/vixabolanezavopebiwo.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/62658453122.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/fotonakunebokisuxet.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/lumusodutaxosete.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/titazaripom.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/zilojo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608222d80ea9e---segomixibutawamoridi.pdfIn PDF document text
    • http://quaint-house.com/vivajofupevumigijifus.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/4d9bd7565efe1ea9a550f15c7a6a5e16/9543954082.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nmq9kclb5q53o6cccqtdol25n7/ragokuzepakegudup.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d05f89bd7---topetumuzumulofedezunapod.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cbd4cf132---jawosex.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/dovopigasazanuzupetu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076187e381d2---lebomowagupufinivufodo.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/32864852805.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/d1goq97rvg2d6ht5p74g86od9s/51942036057.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac848540469---85303478623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=roblox+unlimited+robux+apk+latest+versionPDF 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_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 17668 bytes
SHA-256: 8fb1e2653a95694c055dc02a121d319bb1c4d46092fcf0e742a2178a2c5b56e7
font_02_sfnt_off000142ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AD 11100 bytes
SHA-256: d2ed27d10432a8e45421ba3ead0928e372e887de8406025bd86a25f10690b063