Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4da7a2aba4a514a…

MALICIOUS

PDF

94.4 KB Created: 2021-07-27 22:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 117f7f437d8f47ccaa3a9f470807ff4a SHA-1: cece2b8f6ea04825f4fe252e25c7720a1b8e9111 SHA-256: b4da7a2aba4a514a79364f2442ab1cf44dee10e23093b3ca47f5cc3fd6531eb8
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to manipulate search engine rankings or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa06aa1709e---zasatilebenaniketum.pdf In PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607097ec1b6db---91652614383.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7eb0d816f---nuluzewetod.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/65v8mo4f3gf2nr83mf31o0c303/vuzejagugokolebila.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/eaebfd7442790b7c462d137d32c80ba7/4692166357.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/71184477234.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079532e881e3---potipojinixodemeb.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba8912566b---letuwoxuwiki.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/01aefe781a562a1fc3af2de78358f401/bexerifuxorabek.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/804b098b366eeccf6a7d8d068a385ce9/25205535828.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/loripa.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/83snvec2ia0ce60b1bbkrnijp9/58363401067.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a14c704df8---nabobixevomakuxe.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f5fbeedd6---50387463669.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/ruzakodego.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/28613216659.pdfIn PDF document text
    • https://isleo.com/i_photos/file/sigavanowolewafukilegeki.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/7676222900.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6333b02e34---97677823551.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a10843c7cc---sexaxofipawaweponim.pdfIn PDF document text
    • http://bonsaichik.ru/images_uploads/files/kimipokigi.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/47088694085.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/aec957a51f1e36d501529677d8f682e0/dobaxupupudoxigolovile.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9ffe78731---nofulekufidu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/uhh9aagg6ttpq0vr66muh5ob83/45872857276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+long+do+wax+melts+scent+lastPDF 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_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 18040 bytes
SHA-256: 924adfe7098f8810b6748d5761611c895af8f4c34fc6c37ac607d66922548e2d
font_01_sfnt_off00013acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACC 10700 bytes
SHA-256: 1e35300fc8eb7774fd3c43fb7a17aba45969253cb372e47d659280b401c28b07
font_02_sfnt_off0001533b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1