Malicious PDF — malware analysis report

Static analysis result for SHA-256 02316bb78f8ff480…

MALICIOUS

PDF

85.3 KB Created: 2021-09-10 00:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf64c8eb70c932968a2381382251afa8 SHA-1: b07cc5c6bb4a5ba92b5427d9ccd8833bf604a93b SHA-256: 02316bb78f8ff480ebf4e50b0712d41ea0b3f6e100833ac51d364837ce44fedf
156 Risk Score

Malware Insights

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

The 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, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

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 https://catamma.ru/uplcv?utm_term=all+guitar+scales+pdf PDF link annotation
    • http://sunil.kr/uploadfile/fckeditor/file/gegivilagufexositiribex.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/57955093211.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d55694ed4c4e68350262a8330ffddcbf/57264408525.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137ccd32cf38---barifokute.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/63668903159.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/gomobawidisumazepib.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/mobutijid.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/warumovawoduvetotig.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/51019158320.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/18902927864.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/12366569920.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/ravisigemufe.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7596a950b037f885acc49c04fb302cd4/xegalekofoganegamofiz.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/80968344894.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/ragasefunirumivodak.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/lenute.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/bamojesokutunevazazuro.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/11080338901.pdfIn PDF document text
    • http://secretinvitation.net/images/files/zifaluvijoku.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/bafuzirazosuzokubutenagul.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a977c42d7---vigetuvixazudidujodowanu.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/46031620853.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/60871304087.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/30438197685.pdfIn PDF document text
    • http://caythuocnam.org/images/files/jevofogizo.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_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 10652 bytes
SHA-256: 5a99d576aa548cf7b87e427cabb969b1bc29787b11723cf9cda1f5c2e4ce5365
font_01_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 18012 bytes
SHA-256: 01e178769b5856d4c5912d3b95ec577e048bc4decdf0573b30920d29bdf77beb
font_02_sfnt_off00012fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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