Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0db2b44cf1af5f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 17:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b71164fad42216cfd6467504011d1c77 SHA-1: cf306a408fdd60d7508aed7594362f91c402d546 SHA-256: ad0db2b44cf1af5f61b4d70ae6e7774081916d2a1db335c8fe38fe217cc271f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external URIs and links to compromised CMS upload storage, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=simple+past+exercises+worksheet+doc PDF link annotation
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/tulom.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/bjapri8appqoheolh4nd7u5d37/jogip.pdfIn PDF document text
    • https://grancom.by/upload/docs/5979142741.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/5118932976.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210818092254_xt8sam.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/luduve.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1627854386_6c5d070073.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/xosuden.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f81c914a57f---vukifaxegozosixibevomufi.pdfIn PDF document text
    • https://nyig.com/files/file/jutipexofenopejej.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a445443fd5f---55986398285.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/bowijutironoluraja.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608e59bc272e2---wedeluwuf.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2199ebd8832f3821d63c98ac12d67705/zikax.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/jsghr5khlpj7ig44ku13q879f2/jutagigex.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/416300885.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613028813e48a---40365544432.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc45f3dbd---juwufebufifobovaregesov.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9d0876258---wuwemifus.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a52e13e2---40435622563.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e2caed341---jagoruluke.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b5fb590b8---duxugitetov.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/sogedaropebifevulenuvaji.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/mumobuvefezivuv.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_off0000cfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEA 11028 bytes
SHA-256: 3e6ccf7442e019eded80a21f6f2be0d9c83c1d2b5cf13d0b43f4622e7e156771
font_01_sfnt_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 18816 bytes
SHA-256: 1bdb5242d394bae759c6f26347309ab89c4771cba6d487aadc9628e289bf5e24

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