Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5f38fa93487919…

MALICIOUS

PDF

90.4 KB Created: 2021-08-14 16:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7ecd06e00b57b164163d7563414c66bd SHA-1: cc9c6a33fa05bdba4436d26df6cddc5ebc509883 SHA-256: ae5f38fa934879194c9232d88fe53d88a99163d666ba4a98ad0dd58119fb24b2
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096a5ac784a4---puxujavojoganewejevivusu.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b47bc052479---25034499341.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/67738186044.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160850e5782335---butagajetifujatuvazuru.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a5bb70c35---56992728492.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202171190236463.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/61804142780.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/66788092000.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/80df704a27d8c81c9056686f4d78cca8/66997689910.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/r0kl76sepua1ilgfa2uq5906kb/67509348140.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d1f921ab2---39584155878.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160810e3316c00---72712885966.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae672c016---pegawi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102b7bdf00a6---xebewajov.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607be2c0901b0---luxig.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/lexivase.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3dd271fa2---zadinutisumemiz.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/gv7q5qv97ph3a4326tg07hvq46/83285778527.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74c4383cc---72822529644.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16204554909259.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ccef1d44---pusebotifanofipekavu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/63644701841.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/84994144919.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/dirorobivuxodetevimopa.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/27362059912.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/momikapigawodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+video+call+pc+to+mobilePDF 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_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 17332 bytes
SHA-256: 7dc3225730d81d4d30fca62acc24ad11cc0687aadd753e3789ccc64e1ef46823
font_01_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 10588 bytes
SHA-256: c128e61377878d0131e89db1a4466bbdd96de7ed1c0d955682fccbd985ee51a5
font_02_sfnt_off00014192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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