Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43d8b6f63a1c6d3…

MALICIOUS

PDF

85.2 KB Created: 2021-07-07 13:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82220fa04afa22084edf34df453c6bee SHA-1: 21fa5faa01e77b876040609cdd4192c11dee4172 SHA-256: c43d8b6f63a1c6d3d53cf7c1c7aeda5dc523ac3df45ff14f9cb876788e6e4daa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hlqkvv9rldsjt8tqkq4l9cpt13/16611110071.pdf In PDF document text
    • http://beateromer.com/bilder/file/bivezozojavizitudud.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b419cdd2---89630219823.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d25de0c38e---76965102257.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/wivoli.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/2793442005.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/vixasexajimexepij.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/31973846154.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/lepopodaro.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817c1186633---rumujegoleru.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/balisemogijujejarofiraguk.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/fkceggiogj0o0cir68dv3e0aem/bupirowubuderojejiwebi.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072f607315f0---25670087301.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/reirjqj27q9i54m8q1kk92hmh0/628806967.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df0a7d5edf---99335566335.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/bowobegirivigun.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/20159974256.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/49972999207.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fa0922d0c---50447997245.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160841e5a32073---gevogitowiki.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/avds2e5s7opudufsg30ugd8dpi/mezexopefusaxelopavolemor.pdfIn PDF document text
    • http://askort.pl/Upload/file/77131864851.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074338d7fb38---kufofob.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/15203568038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=database+management+system+a+practical+approachPDF 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_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 16800 bytes
SHA-256: 394229bfc11d5641b31f967c6283998c96652df36f742c2cf9e184dea473c377
font_02_sfnt_off00012d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6B 11076 bytes
SHA-256: 430a20b3f2e5422d6bab6f0dc0964426edba812a810f7c5d2dec7a894a27efd2