Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6808776660065b…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 08:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0b9b1d2bc4752cdc55795595036313f7 SHA-1: c58b0a970394bf6e2e72ca4ce9619b1bd96f4c00 SHA-256: cb6808776660065beeaa1c9b51d35e25a100fc7d79b4a63c445fbcf9abc82327
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://alquimia.in/admin/fckeditor/editorfile/32167183067.pdf In PDF document text
    • https://highendteen.com/userfiles/files/wibikamenuboxululogakob.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/tatowimovuvo.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/45450072303.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/wurov.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ffntqjjna3bk0nigpdm9mr43g8/51473861753.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1632668908.pdfIn PDF document text
    • https://satesayap.com/contents/files/41284450370.pdfIn PDF document text
    • https://phm.vn/upload/files/melanebuwigekujeg.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/14531814218.pdfIn PDF document text
    • http://allasclub.com/campannas/file/wivuzefubobo.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd0adaa1f7---pepevodemidofesuguna.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/63807494127.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/31572874759.pdfIn PDF document text
    • http://acril.ru/ufiles/files/44031804819.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/bc7e38d9d4afa1af13c3c11f0e469e69/nenokokepojir.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210902202630.pdfIn PDF document text
    • http://clickvay.com/upload/files/debokokunixademepad.pdfIn PDF document text
    • http://freewest.at/dovavusegikawego.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/jv84asf7g0n0opfkg3v3oqrtsk/35250805841.pdfIn PDF document text
    • https://auto826.com/uploads/files/zezufutes.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/46968658457.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/33302998625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=real+racing+3+is+online+or+offlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE05 14716 bytes
SHA-256: 9246230945d87e29128f23945791fd6a86d42f52ad98f0ad1feaf5462e99ee74
font_01_sfnt_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 10628 bytes
SHA-256: 0c2242d891027b9c26519a5be415d1e43e68a3918d3e85ad2faf456cb7d48241
font_02_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1