Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5a77ace647643a…

MALICIOUS

PDF

98.5 KB Created: 2021-06-29 16:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 07496483ea51f2a4dc80dae360c3bd31 SHA-1: e0d5fc204bc429531e916bdeb33895d704dc578e SHA-256: 1f5a77ace647643a7595ab1b89ffd7e29b8b5d8db475927cf8082a3cb0c846f6
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple links on disposable hosting and the use of UTM parameters further support a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/de45f4f91fd104b16540256b99f681a0/7129141105.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2fea15a6---88393613373.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e2c97d7f3---wabifug.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2b03d5e5---gidokevuwagajalukamigo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e43a9fb4e---96397718074.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc952accf---6363993361.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/82318541377.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/721f5ee75d6fd6237f3a3af6c9f7bbd3/20718695792.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b450208e089---zubodere.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/49148454192.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/rumimabidajexuju.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad23c9997c8---fatukefatajinekumurogor.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90b00c409---jijivesut.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/75654783510.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2a534af73---pozibameni.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/kerelufofolajobudiwarepi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087158de5061---tujarefebamowi.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/83589209491.pdfIn PDF document text
    • http://webbuilders.com/files/file/gilujefasewekasowuzuditut.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160796b8d58b37---22889013748.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9b7ab1298f61f9a3e033115d0a306611/pulekofupojezosarosebuje.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/eoc1tt1l4fco01ah65f298t1g0/fixejugoroviseduxajuvuras.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/fawali.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/dhi4kbb1oluqifl8bsen42kr3p/79669692018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=textbook+of+anatomy+and+physiology+for+nurses+ashalatha+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_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 11544 bytes
SHA-256: b66da33993082549a978ed443de98d60db4ad57a6f659300aa8d32a589330fff
font_01_sfnt_off0001375d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6F 17040 bytes
SHA-256: 80e55bea55b0968fb2552e84689c557c3d08175f897dc36d31d0703aefd1f7e4

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