Malicious PDF — malware analysis report

Static analysis result for SHA-256 75923ea30472fa15…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 00:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 397f279176b0c8081b3d1d0af76708bf SHA-1: 215bbc7419b0a8a203bbd2261168760833504afb SHA-256: 75923ea30472fa15585d78976426b8a6b2e6e77fb884804fc7fddb9adfd7fe1b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the URLs as a link farm on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=salt+nayyirah+waheed+pdf PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ffe93bb266ba79338ab7f361b893f1c2/vavikip.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/850feb4b2337dba19272118fd498979f/marexupi.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/bofijesajarizikiverubi.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/44393659326.pdfIn PDF document text
    • http://isvpro.com/custom/files/lepugitig.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/cbffd7e0f65fec597c4d1fbe8bef8680/botelo.pdfIn PDF document text
    • https://tavio.ru/files/file/bugisabutuwidoxevetupalof.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/685551736.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/dotudukufizezupolejisotix.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/nirujatagovufizobiwegor.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109042236016246.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/26626275083.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/xitusemubosidinazofez.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/17623570773.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109051521397800.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/dosavumok.pdfIn PDF document text
    • https://kuepancong.com/contents/files/88942786574.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///96492194497.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd688c69a---47427223249.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/sukubosaziwedo.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/boxiwapudomuzibu.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/bomekefefumiwo.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/laforozetopetulipu.pdfIn PDF document text
    • 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_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 18272 bytes
SHA-256: 0bdf45e18a361b92bbbaeb389debf9229bb25dd135cf1cb3f9e47555d9efef56
font_02_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 10584 bytes
SHA-256: fd0563cbf22ff2c7900b9fbf1fd423ad61dfb1a17c34b0207f78bc58c82b1a8a