Malicious PDF — malware analysis report

Static analysis result for SHA-256 753fdad2f4c9c514…

MALICIOUS

PDF

84.4 KB Created: 2021-07-16 20:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa76c565d5d49334fac81b3330cd9259 SHA-1: 8106713d836ead6c5b82a2a1edd8606a58e2f33a SHA-256: 753fdad2f4c9c514a870a9e5d7faf8a5d6c412f4d64ccf52fb46c1478bfa55c4
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. The document employs a social engineering tactic, presenting a lure that prompts the user to install a browser extension or update to view content. This is a common method for delivering malware or stealing credentials. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is part of a link farm designed to redirect users to malicious sites, likely for further payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/776ad1302dc6e6611633ead04f090e1b/wekunazisobitilusejuz.pdf In PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4cf46be4---63234160283.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f1f5deb1538923890936b355d8053533/tekerenijijufojegamenagu.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/1c1b5965fe8a0e8cdfe77b524c67e922/78683230996.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/33050261172.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/88600841221.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/48qkelm55mmj74e32dhkjaej83/20341555748.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/78494073813.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e009eec81---kazasujusovokatepo.pdfIn PDF document text
    • https://actorconseil.com/files/file/65925297893.pdfIn PDF document text
    • http://princeverma.in/uploads/files/mudejezipila.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/240066fb1562ee211f0ed546df5b21f4/69350645019.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc493eb143---gofutoximezebuforesiwaz.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/69407035300.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/59995671103.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/b4se1k4i2jnubfo407c2tf48im/67675261615.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/balikozotakag.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ab89de25---bifisofafidinojo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c94071cc3---83875310186.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6006bde4aacdfff6978c272c0a1f1aee/52568923713.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/00d84f8e9caba1ce3e7885daa8fa817d/dujakuxokamirumop.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/xegokelenekunofomegefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+edit+a+pdf+file+windows+10PDF 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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 10640 bytes
SHA-256: a3ac0ff6a2e2353c46716c14c1d9591f2dfa408b649d948ef683c34fb87b86de
font_01_sfnt_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 16840 bytes
SHA-256: b138da2de46cabc5b23449b75bc854a145d9325bb689870913f13449dc818c53
font_02_sfnt_off00012c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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