Malicious PDF — malware analysis report

Static analysis result for SHA-256 776bf08187b7b8f1…

MALICIOUS

PDF

87.7 KB Created: 2021-07-16 22:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19378cd9d17d4519784aa9ffdf1d9d07 SHA-1: 13f2610b2c2dc4da846a7f41520d40f58350a9b8 SHA-256: 776bf08187b7b8f180f97a50eac58e6168594e83c728e2b00078d0cda155ee2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics suggest it functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely lead to further malicious content or phishing pages, serving as a distribution mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607927a2d994e---80923475289.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7dltik3pr9jtarp2kt2s13h1g6/nuzevovusapidafisopexagim.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/28353d184ac7fbdc1a201d34e12ca2e6/47278490691.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/75f5aca9097d7693928b336846e16f87/xazilarimiwizesavine.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/44720137194.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b8cb91187---66446961329.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a214bb5a2dd---sufido.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/69330903840.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d5c994ffe---10318778706.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/dd10a4c4ecf299bbbc6b50284603a9bc/kobaka.pdfIn PDF document text
    • http://blueyee.com/upload/file/202111081924.pdfIn PDF document text
    • https://immobilgold.com/file/22274979551.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/mbtilk69nvgvleid6fsilks5pv/wopotipavinosudemawid.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1405b2e8e178c2666f3e037126ae20fa/65533373261.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/90267503940.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a48721c09cb---90188470127.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/minevovamifob.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/jobaza.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/telasozuvasigar.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baf472ce0d4---73009725403.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/73521572066.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/tobitaberopipomaranep.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/4140801816.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/17076441947.pdfIn PDF document text
    • https://ak-oroslavje.hr/files/30271932956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=exponential+and+logarithmic+functions+examplesPDF 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_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 18168 bytes
SHA-256: 22e3d9c0c02663eec3bb7404917b3baf3ce01e74058c6897864cc07c9126786d
font_01_sfnt_off00011d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13525 11252 bytes
SHA-256: 6eee749107b78831dfe2691040a79016fc20a192c606926d0a931bf551316ef1

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