Malicious PDF — malware analysis report

Static analysis result for SHA-256 78171cc3d9992029…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 09:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1f6ee0646f2a7684368a29f500f04df8 SHA-1: 856388b02e37b2d7e65f2c4e262cda2fee0510db SHA-256: 78171cc3d999202931bc84981492c6d1219f8ccd9fdc3a854b3bd527bf1aba94
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://medvor.ru/uplcv?utm_term=the+time+in+english+exercises+pdf PDF link annotation
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f5c4db1b---1901605160.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e50f39f8c26ced43a2261364e275850a/6457785094.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/2bdb67b598ed8bd61c1dd2e89063ee02/rojelotefoxekeku.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/eo0mcofvjlqliqothrpo2n1h4o/58071737913.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/44170817931.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/fibuziz.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6ea3fc22137a4dfd2f3ec39fc1d16073/11266575027.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zelubuxomo.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/314ddfb25b609f2c68d4c033a9bfaa44/todusodigojig.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/2298072068.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3305361519.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/gsa6j64fbt3pkpooo9j4eb5mc4/zekejos.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/cfbb75579736d17b09acb4f8d566d57e/pareselajimozosejiluruwiw.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/87e6f266bf93f8cd7c22df1f6e8f381f/tuzomupib.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/jesibutabupebasomurezida.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/87078262356.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/lusowixaboderevomoz.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c269c9bb3bae46001cc8931c72cbccf5/96180160085.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608611cacf296---85153487460.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/8johpcihjvlruvk6ha8g3p0i84/15409890887.pdfIn PDF document text
    • https://eternalbliss.net/file/jusomose.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/hf4dn6411ncsi36f3n33cg5p5v/43103518259.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/gusuxi.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/80745720533.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/b0228793f4b1b39bcfb772ff4bf17b43/10232046406.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ecb51d13---gerokufuzewix.pdfIn PDF document text
    • 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_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 10852 bytes
SHA-256: 71379c362e47fa67e5d0377a009a02961df6f7e74572747497e687bef3ea269c
font_02_sfnt_off0001154d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 16920 bytes
SHA-256: a02b9b4fcf4a61e1dc91b9e0448ad11a88848f75232d09c9bcd066cf94f424a1