Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5ca9313f175073…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 20:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb5e0d36b77259e01ec3163fab577ba6 SHA-1: ffee8bc0f312772a409256f3d6b852aa366cbfc9 SHA-256: 2a5ca9313f1750730562a9749bcefce0e2c2f16b6f3ec8740b4985f2f4bcee06
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Analysis revealed it functions as a link farm, with numerous embedded URLs pointing to external sites. Several of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to obscure the true destination and potentially distribute phishing content or malware. No scripts were extracted, and the document body was unreadable binary data.

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 http://lindendirect.com/tempimg/file/30591793304.pdf In PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/guwerinezefetamomoki.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/14120382893.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/bizinujoripifidububedi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e9339f39b2a3bdc71a418f1abf751d92/taveremixovununik.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/30706476561.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1c936cd7---33757662715.pdfIn PDF document text
    • http://standardamulet.com/files/files/fetaz.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/57914832621.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/82442351889.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/7961892191.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/mebapaxerinu.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/95282644357.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/negadutilizisuguwo.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/kovode.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/kezonimimolaruwujidoda.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/mebokukojigojinoxakisube.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210907170406416.pdfIn PDF document text
    • http://benrassam.com/uploads/files/53626759694.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/22635391792.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/65227474029.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/vipenalafikekosepisaga.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/1618331864.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/vj09agj929tq3ahrr1g3dcos4p/46631908506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+cinnamon+app+on+androidPDF 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_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 10592 bytes
SHA-256: cfeda578bfca273e302b84eb914144ef409a56faa0ecd6b8cc75a3feb1c74780
font_02_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 18056 bytes
SHA-256: 684e7cd9946ea5885d96bacd82dab1307c7f4370b3dea4ce1824916840abdb93