Malicious PDF — malware analysis report

Static analysis result for SHA-256 021207387678d91f…

MALICIOUS

PDF

72.5 KB Created: 2021-06-26 04:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a4144255195622422ce963508b338828 SHA-1: 36a84e8b2b02bbe20206bf611d23a4de531c7d51 SHA-256: 021207387678d91f4da2da31cd9db83587bd7d0e958858914ae1d77ca360e9a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics suggest it's a link farm on disposable hosting and potentially a phishing attempt. While no scripts were explicitly extracted, the nature of the embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=monthly+losers+nse PDF link annotation
    • https://lukili.ch/UserFiles/files/bawizum.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/25396827503.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8bd03f88---xobezusawapaviximu.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/mumuxatizanomapoxaxa.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/xilevumezajerogevogalegij.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4bb0kvs7tr6bt2le77s3j4e8ai/waderek.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/gofatuwitininoferodi.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/jamaromosoko.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ce2febdc8f2ef2c1279bbdbb8bc9de57/43639366419.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4et7cm12il1u09qble0ggv2gg6/nibizenofijufejonatibugum.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/jemoxeriref.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d004400d296---82979614584.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd38521847---36868449061.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/29378660282.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://pcccmiennam.com/media/ftp/file/nuloxedonazulalo.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/973738e80fbd3cd728d6789e10550b18/35017197497.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/fanekizezuwetovitaj.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1899360c2---wexetukiwinemixopekak.pdfIn PDF document text
    • http://aps-mes.com/files/file/soterimugaxodoxefoxetojol.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/54b1799fa8e840bd88898037393cc53f/41900915350.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/6723587560.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e382be1d---jipetiwole.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b08b0271101---bitasazupikonoz.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_off0000bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3F 16368 bytes
SHA-256: 6258dd02927baf899b451da6af43d93cb3f04d75573c6ca3bbae63a8c1cc46a4
font_01_sfnt_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 10060 bytes
SHA-256: 0f8d77f2fe3ac7ec2388196714f3cfa5405acb81474388edffc780df66fadd33
font_02_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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