Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b74875a8d139e8…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 13:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25da224e99c4901293a22bcfbd129d2a SHA-1: e10ed72cff6e5748c10c8424d4d0cb1b54ea2ffd SHA-256: 75b74875a8d139e8dfd8e673dd95fbe0e687c6fa1ee3c12e661b63f428d78dda
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. This suggests the file is designed to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://cherryontop.pl/upload/fotki/file/13173509758.pdf In PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ub3a3pv3pgl8h91f9dnb583cv7/gurotikigavugej.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612a540904402---kakasedenomegorogevuf.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/11733839167.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/90083335231.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/82d8dpnts0vpdnghe43bl0kh97/6509146355.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607050cf39d73---sowajem.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0ba0d2ba0b9e78168c20fb32a3f266ac/xamabidawepel.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/kimiwabani.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/jasawanajegumexur.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/6529240320.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/gukikuxur.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062608541973499.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105252151.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609df54db7b53---litaluxusefosulerax.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/11640432736.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1d792491---7846899182.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/bakijo.pdfIn PDF document text
    • http://scro.ru/pic/file/wobesiguka.pdfIn PDF document text
    • http://thongthien.vn/upload/files/13578975076.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3f0c7aac207a22837201b470d7c53da9/88708525321.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/72942217654.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/riwemol.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe0d32176d---45666961477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=examen+svt+tronc+commun+bac+international+pdfPDF 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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 24484 bytes
SHA-256: 3cbad02cb359ab0c158ff72abba37e994eb476b754f6244c57aa211ca9393989
font_01_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13571 11172 bytes
SHA-256: aa1533fe963a823e68aa5c28633147116b7c0f7f4f4e2c82b431486b619a1892