Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c33ad01e62bcc58…

MALICIOUS

PDF

100.8 KB Created: 2021-06-14 22:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b56051c51e73cee1d9720dcba6434d2b SHA-1: c774830780c6e02cd96ebc647da793e57a38c93b SHA-256: 8c33ad01e62bcc5845b94fbe9414c02d11e9995d3e9a491eaf936dc9267195c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing lure, employing a link farm strategy with multiple URLs pointing to potentially compromised WordPress sites and disposable hosting. The presence of a 'download' button lure, combined with the ML classifier and ClamAV detection, strongly suggests malicious intent. The document's primary goal appears to be directing users to download further malicious content from these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=hard+beat+instrumental+download PDF link annotation
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c100775b---75391503222.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986b023cb5b---60049811961.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/xifexagu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607286791be86---jajunorelemew.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/srj4jt75c7bs3pb0j1209anle8/18931670546.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//83195755939.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/sekemob.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/sagixuvilogew.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608911cae3d77---noxawilesatobagobaganivab.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb43437be---91894214713.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/fixesogutos.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee949b9efc---pewubebede.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0cb786d88---zalotigenu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089e10d1e947---98725265504.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5c60decf---jusadilutikiton.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 5044 bytes
SHA-256: 7ab7bfde8daa9d20e3b26de3d49f9622cd8d8b61f92233ab1fce210e8cf40a73
font_02_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 3452 bytes
SHA-256: d53be5b69c7b2b1f5e74492dbeafdd44946a4a3f34894603fa377e012e318f01
font_03_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 11700 bytes
SHA-256: df3446ffd8b739c28c959306744d1c00b62cc4ca1c12fe7363f126fd1929d523
font_04_sfnt_off00013ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE0 18888 bytes
SHA-256: 93e6768e7105fc8b05f62d34253e262a784d28213df6aeec9ad58ee8d9dfd147
font_05_sfnt_off00015aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AED 17480 bytes
SHA-256: 938d9bbb6975f16353c649a95a1bff0f311a9078bb59ebbe84504977bb8b76e1
font_06_sfnt_off00017479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17479 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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