Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e41253bb697ad9…

MALICIOUS

PDF

95.0 KB Created: 2021-08-02 14:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d5ac7298fe9c198d0bea1f2f4ad063d SHA-1: 9eb3c21c81ad9d00a8312d1d5d4adb05fea7e1bb SHA-256: 72e41253bb697ad9799b9656364ce0407266108070564a802c8cf73a31ae3a07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://apz-arte.com/ckfinder/userfiles/files/63978906679.pdf In PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160770c871c36c---wejilowapubitiligitid.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/54673983691.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0020ef28208ecf68f06ad414d74ebc75/rasileborip.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8a0f3f77f.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/pudotopodep.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/11883ea85fe5f8c79aa0a441043e8ac5/60937174934.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/witumeliwofibopukegu.pdfIn PDF document text
    • http://kmsenior.org/file/files/46863042250.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b45ce434---30362034041.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/69633242172.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/vadavodizibejuvopegidafe.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160854933f3916---71576119155.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c568c88e130---6057677827.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/rutuvumararules.pdfIn PDF document text
    • https://melz-feu.ru/upload/wipesitixosirarefebaja.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/betesumamo.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/u7630rag1s23p6ncd0rqeni95e/2349521976.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/litavagamikepe.pdfIn PDF document text
    • https://windsbs.biz/files/file/57163486067.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e08330a720422dac299aa364ecdffebe/86448676810.pdfIn PDF document text
    • http://jrjohnsonfamilyreunion.com/clients/0/09/090f04f22b165063c0e57546eb93b169/File/52973281197.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ovgoee9v1u7ng75po0v1oo4gj2/79177287325.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608731ade7e4e---61415203493.pdfIn PDF document text
    • http://ippon.lv/uploads/File/fubonenemode.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc287d77407---58448734782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=t%C3%A9l%C3%A9charger+anachid+dinia+maghribia+mp3+gratuitPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 17484 bytes
SHA-256: e960ba9af729e9221b21901c44c1cf02c9ec7a01247a3cba5a33d3de68fdb504
font_02_sfnt_off00013750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13750 11204 bytes
SHA-256: 4e3825b399b5b3c59a9748550262f38610f454826e9b16e6375d23b06cf0cd2d
font_03_sfnt_off00015099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15099 17312 bytes
SHA-256: 632d627f8f35d26cff2b1befadc9eeaae68d0d6c50f197782f060ee3438a8e38