Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4b0a7d1bec85ed…

MALICIOUS

PDF

85.5 KB Created: 2021-08-08 12:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 10a3421c17094ef4efd1b4dfac9f377c SHA-1: 4b8c2fb1013e86e3e37ebd00ed1e3466a2c9da59 SHA-256: 8e4b0a7d1bec85ed2270e86ed07cd15684c0f72a1a6d61d741602680d01715ae
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting it's used to distribute further malicious content. The presence of multiple external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sjalikave.hu/pictures/file/veterigixurutegukupud.pdf In PDF document text
    • https://appvid.eus/userfiles/files/76034951258.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/59535344387.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c13635a4---nuriloloxirub.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c770f334242aee0330b6303dd6419924/69894416079.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/25pcfq6m86p2otk25gnuknv3a6/sopanujaguposuz.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3rgbvlh7qnnra4j6kts0n64pvj/bowizeximapejiz.pdfIn PDF document text
    • http://budka39.ru/files/39598664745.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cbe3eb49d---kinobogefikudobal.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/xofimipizizubiju.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b082e1af4c4---pesusudativi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a070e4a48c4---nevumugok.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e92c31862a8---41912757275.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/39586887346.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/37587302829.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qfefk8tovl5gfsvnk0eb6g6dmd/48351661716.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5a9383383---radiridumunikif.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/kuraza.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/88241141307.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/peluzonunejixinuj.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/7936709881.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/6176194976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+bend+corrugated+plastic+sheetPDF 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_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 17200 bytes
SHA-256: 10e3270d0c6b5690798f21554d64fba5bf1509e8bb969c3f8c7d6442af892610
font_01_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F47 11112 bytes
SHA-256: cc6697b011a205db23435af12d3fc5479a02792a6b92d8c08d2b8d1c3fbf2c35

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