Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e511040da8bb64…

MALICIOUS

PDF

81.0 KB Created: 2021-06-19 14:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71fab1dfe4f3394dd08896da84949f2b SHA-1: 616b8c2bbb8181a8c9a96ff8c623ebb170493783 SHA-256: 71e511040da8bb64766348fca6adde9a5851d458c07ea4932d8d5ba0e27e88af
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, with numerous distinct hosts and UTM parameters suggesting SEO manipulation or phishing lures. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns strongly suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160979a44898ae---bonirose.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bead220f7---pafaroxa.pdf
    • http://market-oborudovanie.ru/upload/file/35890119556.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c625d3dcf53---nuvijunefefesuzow.pdf
    • http://absolutelyneon.com/userfiles/file/bejemosebaforuxo.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/672efc6f259c99222b0da5e76c1bfc25/rerebofewomutalulabe.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o73nubhgsmgs7k7241vj3hmirs/kuzegat.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a361dfe68332c5fbe2ca76f7b6c0ecd8/nasaginasitagod.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/f9711145f4f6fa692bdc30dc5964dcdf/zazudejowetowuwodiwef.pdf
    • http://nousgarage.com/userfiles/file/pubitoraniginugisewovu.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a186545e5aa---zewawize.pdf
    • http://blackivy.pl/userfiles/file/wepuvidelokewoluguvowudil.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/97809003999.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d83e1029d---dojeduwavojofutuf.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/86910c7d9c844751ca664348acc5c3d0/7081902684.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/tfffv8hf2cftkvhar0hpnkph7a/10697982726.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ooa27lml0jtbio4f4haf5paoh7/zefedoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=kuttyweb+tamil+dubbed+movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e971.bin
138b9944535950f3ac0510d4e6efb77d5fb489ab8fea5ecd2bcce5560ba351f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 5236 bytes
font_01_sfnt_off0000fb53.bin
b0f44aeb800c70ccfc0f58458f4043d68c6f81216b672d55e0cf74c6e1e0e87f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 10804 bytes
font_02_sfnt_off0001205c.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 16164 bytes