Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b41b131b1264f0b…

MALICIOUS

PDF

77.2 KB Created: 2021-08-08 10:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 570e5e4bd16f8ef8cd4d9740d6073fc9 SHA-1: 8c61fa2c7ca2e1946329ab1cd97e36f225272749 SHA-256: 5b41b131b1264f0b3b3e95316c483e14bbf1579dd4799202258f5eb9c39ba3fb
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an effort to obscure the ultimate destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://minipowerpack.net/upload/files/10343064622.pdf In PDF document text
    • https://andrejc.si/files/file/46529489516.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/68125589906.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3aceab548---radazexizerufazisipa.pdfIn PDF document text
    • https://roc.mn/uploads/files/43200153373.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0f809db82f51428285150afc0c415789/zimugo.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/sidapixopes.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/51a8b028c1de6c23a5f53c34d75e8beb/roledebofaxerexu.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/pajusop.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3007c27fa---73378633449.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/jilosedesivowafiv.pdfIn PDF document text
    • http://cichanski.com/Upload/file/5070170099.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a4728191cb026a42f39a22f9e0610fd1/lotev.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9671d5440---31849766443.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/37357212917.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b7af49af6---55424215259.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ae6f7b492f960dd4f5692de603785533/xotetarojesibasogojemete.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/55e294ffc243dca487b77c1041998117/danezalirurakuri.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/metolebovarok.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/voredufi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1483c9e977810b97f6c39be7bf4067ed/jirekemer.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/jozijogip.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29172432832.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8d164652b70012590defbbe1c249fe04/nojek.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0e49962ba825b5914751d5e8f6a588c6/lujazitakupugogaguvevizod.pdfIn PDF document text
    • http://vhshf.de/File/dikofowokevanuvaloremuzem.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/jisigoxag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=garage+door+sales+topeka+ksPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 16056 bytes
SHA-256: c03f082bf0540d93e2de9a656b40ecba86c0957b533a7f07775c71b0616cdfe4
font_01_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 10504 bytes
SHA-256: 85203ce63af394eaad3b1e1b0bc1d0f2fd21199f8161d838280e07fadc7b878e

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