Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5095de6de61a019…

MALICIOUS

PDF

94.0 KB Created: 2021-08-17 14:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 607a7238a3222f141881edb48f51b098 SHA-1: 30520e188a967e63f9a3f702a993f64dfac223fa SHA-256: b5095de6de61a019c326928081a396feb4e042dc870a7a8c64e6113ffa53af42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=miniature+dachshund+puppies+for+sale+in+indiana PDF link annotation
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/95e1cc9254af9640a31715bafe2d08de/manevi.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/v9ac121i1e12oab1i1krm3h7ug/30482002205.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a3732b6---dukudalodojigamipesolor.pdfIn PDF document text
    • http://intergeored.com/upload/File/97625613468.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/3e5192c5f8ebe9017d847dd386afb236/tadadomekubulu.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/tiwegejerizaxawaz.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9755bc5289---55708275133.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kopisuzelafudanijun.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedbe5f171---kuravufanazozamuvijewezam.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7f30d586ed4f5e5d165c49d397bd9235/1122979340.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/xirikivetomojisivalorin.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/musoraguxemodaxis.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210624053248_a98608.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f12b1fa213d---sopagisefaranije.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/172333266760ffe736247d7.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/24591620981.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608789c8a181d---kesokuwazasavugegila.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/figurimamujekurija.pdfIn PDF document text
    • http://dsagco.com/Upload/file/22457883552.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/57612403653.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/47230879915.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/a3fa6ud4mkurv55e44ac89c1ih/tatulepo.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210814134801585650.pdfIn PDF document text
    • http://mamam.by/upload/File/file/nuzikekazemezixibil.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 16348 bytes
SHA-256: f2b04fa57bd472238a9abe18ca68f80992fbfe74bfa3f5f6e132e685f126a8fb
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 10812 bytes
SHA-256: 09c22bdf9fc1dcb121ebb7f4264ff3c0583951f3345b1ebfd0d8c840517fc268
font_02_sfnt_off000120ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000138bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BD 17468 bytes
SHA-256: cedd981c46872c307b7a78d36908db259f70a22152a0f3597678e41732ae8cd7

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