Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2b976c75f5d5b8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 06:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 000516984677b37735d0f5777f865bf5 SHA-1: 511cd25795943616c47e754732904a601da0b563 SHA-256: 3e2b976c75f5d5b84a43effe340bcde16e863431014adedbc53c2ca1e2c91776
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous PDF files hosted on various domains, some of which appear to be compromised or disposable. The presence of a 'download button' heuristic further suggests a lure to download a payload. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://geotersrl.it/file/rukejomusagoxini.pdf In PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/13365608628.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/lifiputabaxobetojezevij.pdfIn PDF document text
    • https://songhong.info/userfiles/file/65593173050.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/sonagelurufawomojiwox.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/70762623880.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/372b6792b2d6c65550a7d21b3bad8404/27666327145.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/vixokemi.pdfIn PDF document text
    • https://mszukam.pl/dat//file/34720277930.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f0adf85a047---jorozul.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/238fbd6ba25eb4f79ebf97d6aa5e6bb0/zagerabatofevaj.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hc2qkuhsalj39nccnrf4feun0n/27212989876.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/bd841b08782e10fc89517da9f334cc7c/94691213676.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/4c9cisvckjg9ulrn4ttm06v3fd/41144737349.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1dd05a904e651ce0343c97e31079b16e/94569864347.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/40cf93c9d43a33ed515a74b42dba9ab0/848273725.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/rixoxefotusasesavip.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d209977ea4---zifotupus.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/52950606415.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/7167566230.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/wiponofarudovujopu.pdfIn PDF document text
    • http://cy2hand.com/userfiles/xozopemakonikezilof.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/59796180774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=retail+banking+macmillan+pdf+free+downloadPDF 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_off0000d5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 17812 bytes
SHA-256: 1068df5f7865fa993a8e3d6e0dcba0d0ada6a53a19ce27bcb370cd539c21befd
font_01_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 11160 bytes
SHA-256: 9ad1587da2deccf5c27936f3456d5fa3d1363b44ac6d9fadd254de9ba793d9b5

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