Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ce897b78cec7fd…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 17:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7c7f834daecd39e000c973f50accd3d SHA-1: ecbb052ed4b11a25f10cc57e81f84741ab8d4707 SHA-256: 82ce897b78cec7fd04541eedae4b3c31dcaeec6f9f7ee6917371529bfd04428a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious files. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to these potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f35f8185cf5---651361013.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bh8u0dhaebu2rt66a76vvo43ci/zifovegola.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28a214844d7750527cc6916d7ef4ec85/5947676252.pdfIn PDF document text
    • https://priscar.com/documents/files/januten.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/favil.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/vifisusikerikegomixizo.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/lafifiwa.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/xakabomokuboxujak.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a11c78c9d---gajepakuv.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076d83fad877---48353227862.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/jjr46k3219ftuuptib4dop85e6/87502706257.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/60052604720.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3dc12407f---rojefibebuf.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/fb8a9373235c274aa18c05c897ecd685/16654981241.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/gejazixiwukepedemi.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/pasefalokamodevevajefarel.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/robemajegojejapovabed.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/gobejosokiruzedezodogolo.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f0a6836e---midenimufasug.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/33185871827.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/tubiwemika.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06dc789e7c---sotaritofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=1929+geneva+convention+pdfPDF 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_off0000b89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89F 10788 bytes
SHA-256: c3c428f3ffc4dd66b158cfcd24b60be9a1722576a63972ad203f977b5fc54258
font_01_sfnt_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 16156 bytes
SHA-256: a9e56f6daea6053836cc05eb4aa8e3f61ba06ad6f163e101d693749840a0bfe6
font_02_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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