Malicious PDF — malware analysis report

Static analysis result for SHA-256 074c55c50e3bfd5a…

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 20:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8399674487753cb7e084f7b6cce41302 SHA-1: 73d2e8159192ebe60de9eb2a8994ed2973295044 SHA-256: 074c55c50e3bfd5adbb7c0128c454407c4356d897dcba4dff429157410aa4eea
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of external links, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/47a015fdd78980b7b30a351a892a087e/11934167163.pdf In PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ab80afc6366064e87260feaf7310f4b0/telazamepixa.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/v9ao71hg0dto5lf940urr7je5p/2858166664.pdfIn PDF document text
    • https://proxus.nl/file/kavorivile.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/54278986915.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/20739234113.pdfIn PDF document text
    • https://x-software.cz/data/file/xebenuxogowo.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/75820470636.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/84ce626dac26dea1b35c137495e7ea5b/72453619873.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/66483612320.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/41049567155.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55f99841dd---selukoj.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d3f7d1167---pupudutuf.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edba75d457---jazaxibobejiguj.pdfIn PDF document text
    • http://poiskvod.ru/images/file/togoborisupobilipogowegox.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/44c7967bd22e58585dde285c884964f0/jopovifidegesapu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bea5babdf22---favuwegovoxi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4704cb0d6---fumexapomajufanaliguxu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/daafa19336a3896d8c02d3aea232887a/gitutuminexiwus.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b477644e04---xijopigiresojefujekipawix.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c8e82b252070ae7d3833ad1d3dd44a4e/potaxoge.pdfIn PDF document text
    • http://scro.ru/pic/file/26547660035.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gorojerogotekevifi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c94a8e7a---80332486544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ncert+science+book+for+class+6+solutionsPDF 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_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 10808 bytes
SHA-256: 25b9e607a459d42a64a1fd687e0731133386baf97fe39fe2903a1f61a5ad3888
font_01_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 17400 bytes
SHA-256: b0440b2c84b79c0bc78de86fe12172d57d83148a826826446348743d6a4a37c3