Malicious PDF — malware analysis report

Static analysis result for SHA-256 be45501b326394d8…

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 14:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89ef915b7edefdeec4641555ae2cf998 SHA-1: 22ce9c5efab0bd100e3c263a07c70d5e2e51ab86 SHA-256: be45501b326394d8143b4209e06ceee41bf9951c34aff06bcca40d0158ba531f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 https://allytemp.ru/uplcv?utm_term=neamen+semiconductor+physics+and+devices+4th+edition+solutions+pdf PDF link annotation
    • http://medwin.kr/userData/board/file/27521108896.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/19713406818.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/kojoxanavujuf.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/13096340544.pdfIn PDF document text
    • http://mamitobe.ru/files/file/20868339515.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/bobegelubifakurevikaxofe.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/01/59535188617.pdfIn PDF document text
    • https://digireg.at/upload/64046089343.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613565a18daa1---98713260623.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/gatamupasifefeno.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/66057101664.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161351e8551e59---nurotu.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/gepokumoxiwafilisukodew.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/kipodufimaxefelazusukobex.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/6832217211.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109081212332698.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161301f2688573---45476763509.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/58505476411.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/mijaletom.pdfIn PDF document text
    • https://emenu.hu/editor_up/57056386464.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/mowipexaxafenegolopiza.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/95570114482.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b72944f72b48f87087347b12d08b5c56/95032677722.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/99942281607.pdfIn PDF document text
    • https://kuepancong.com/contents/files/mijitotixalefovoxotuzi.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_off0000c026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC026 17280 bytes
SHA-256: c980cf02f7ac68253d745156459c697ae0e36bc6e52aeb43188e8d44639010e2
font_01_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 11220 bytes
SHA-256: 91339e92abe4cf63392a0421a48313635d11f29a02e6c95fd659e3e482ab2e39
font_02_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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