Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a48b8ec0d86404…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 14:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fb8016420d2f08a2f012b064ab34166a SHA-1: f1c1ac92c82e91fb27b5a52c0dcc21e008b193db SHA-256: d8a48b8ec0d86404b529d9f15a7c7bba832d69b3c93c40a57004ccf42e7d9fa3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised or disposable domains, suggesting an attempt to lure users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ahdongjiu.com/upload_fck/file/2021-6-27/20210627142804359329.pdf In PDF document text
    • http://gillsandgeckos.com/userfiles/file/marolelaf.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/lgee19q1tmahvahgcfpjfhggt4/44237332326.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/53120140812.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zelawejirofi.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/17539407469.pdfIn PDF document text
    • https://baongochoa.com/upload/file/gikas.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/80259883325.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/30950119939.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/vemusuwon.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/34899056295.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/dudajaxapupin.pdfIn PDF document text
    • https://clinicscrm.com/img/files/93771164079.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/12985076632.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a256b2c5f5a919692a30b7360a3e492c/futiwutufibifiwa.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc0a1a3e9e---koloxun.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/53554868577.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/luzefupikuzevakukojufa.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437c485f61---39990254521.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d9ca51f47808b507a9341aca7fc227cf/nodofusir.pdfIn PDF document text
    • https://appfacile.it/file/94898633837.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cbcec2ef4d6f6b671d7fb74ad0f204c4/81599708983.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/teboj.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607835613b62e---degidatumugavana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=coldplay+fingerstyle+tabPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d1d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD1D4 17124 bytes
SHA-256: b57bcbd2c7be64b4a1ea8b2e87508cc5f69351a500271b52be075d05aac235be
font_01_sfnt_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 10960 bytes
SHA-256: e41a0588cf75e29bb219d18bd92432ec70bde5c51c5060811b8c6627088ff755
font_02_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 17044 bytes
SHA-256: 59917696776cb310b4a537b914f492beb311f8eb88a2caf475a248ca1bb9905f
font_03_sfnt_off000130da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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