Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2b971b18fa27c7…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 09:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 773478111f1e4a9ebeb74413fa6ea005 SHA-1: 16b9c566f1871ad2b8826b534b3a3b03cc8db77d SHA-256: 7b2b971b18fa27c7bc6b9efcff454262e16bcc4dc8ed292834fd88e6c28c3889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's used as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=world+of+tanks+blitz+mmo+mod+apk+latest+version PDF link annotation
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4a402cbc9---42124804213.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f5b9764c5---40268088753.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/89929894990.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/wamutev.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/jawasuxapominukutikox.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/37701630382.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/fepovobififumov.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/65411843773.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/jetegovajo.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/89881871633.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/69268786317.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/vazomedevax.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/56f3878e2dd23dc4f00bcaacc42fbdb5/kakime.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/d479f6b8b0a4e0942f73033bb9047167/94527973345.pdfIn PDF document text
    • http://liyangah.com/Upload/file/gatuwi.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/nibajal.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kog8snfvn8hgarbbjiblq32bfe/84220736025.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210920001159.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/83586822664.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/62032217514.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/vokoxegefoxavixat.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613682ada207a---loxasiwoperipa.pdfIn PDF document text
    • http://hotstamping.pl/files/file/sobatenisotigor.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/banatodibadena.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/puzamowegiwawab.pdfIn PDF document text
    • 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_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 11012 bytes
SHA-256: 435d6766067daac1264e9bcbba1b9c0f6da1838911eb20a63b2913c8a95c04f2
font_01_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E6 17724 bytes
SHA-256: d8d166ebf8b24f1ee9ed15977ebaee772168ec7267432e61f3ceab68903e8804

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