Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1179eaea969f62…

MALICIOUS

PDF

77.5 KB Created: 2021-09-22 19:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d921970372c3d01498a4bacb73683bd3 SHA-1: 33645004752fa92d0df47d5ef2c0f23f392feb70 SHA-256: bb1179eaea969f623fcc23e3dcf055f7920d5a392094f3b306df5c3c7ff0d1da
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and embedded URLs are sufficient evidence of its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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=android+1+score+hero+2 PDF link annotation
    • http://snft.ro/media/file/91593338520.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/8649638523.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/vatenemeselovokotusepufe.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/wigonutiw.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/6749317109.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6c44ebd10dd3c434ad4bf69cdc95342e/poganalijoxilowo.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/janoras.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/14683108199.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/53723706956.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109172319045954.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/11458780080.pdfIn PDF document text
    • http://hzqzg.com/d/files/34762553578.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/31128767164.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/kexuzepevinasuzadazofa.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/pimajiz.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hs92f0v80agt5vp9ugo6md0eg2/domewivabituvunisen.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d30a815db0b7e81491404ff08bff00b9/pexevaxeguripet.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/58437804536.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/49635132737.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/poxusedipomekoramuli.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/95454610024.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/penajivuxudinixavawelof.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbc049bff4---28237973048.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_off0000b8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F0 15876 bytes
SHA-256: 1043402c2b9b6f3755566d66f00e78969687f3e4a2573e88a8ffee3f2a1aa297
font_01_sfnt_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 16680 bytes
SHA-256: de74d7cddcf479278b8b0cf8295d5ef9928bd3ee054a2c385df84f69d53a4d76
font_02_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 10316 bytes
SHA-256: f5ecea1a2c4d70d70e37f8513261bab642064f8f787866736fbb8d1f1b66da11

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