Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a180255d26080aa…

MALICIOUS

PDF

72.5 KB Created: 2021-08-09 13:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0145f7066eb17f7a457f3a87e723e94 SHA-1: 6602355e822d8b9c27eea38c097eb913a97a5ee3 SHA-256: 5a180255d26080aad0fa91de9b1fe6493c567217b0fa8d45b8a280b32bad59bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself is also noted for having duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/1ee4736fe5dbcede99736059ecb44c3d/40385998962.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd22b22d5---96140768261.pdfIn PDF document text
    • http://toonesk.com/upload/galun.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/41368361553.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/53760212599.pdfIn PDF document text
    • http://m2m2design.com/userfiles/nefibowifirim.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/jodibakidaseb.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/72360374267.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb4e48199f---netobodevajiji.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/jonozunulirog.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/rudozoworovalalij.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d7faa6f4b03c35e17602aebe9768a6a5/91955247.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/59562482824.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/un0sjqdg7ilsm8j9uho220ekl7/taxekofot.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/jmo4tq49kc6ierli9d7l3kn3i4/begonejisakojo.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/2gb9mgv0npdokm5demk3nt9jc2/83441336055.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/14365167173.pdfIn PDF document text
    • http://greece-ex.com/lunesaxuroderave.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c5902226aa3---19290002169.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d50bf472bb---netogibepalomokejoxuma.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7srmtu5756mdag309dhlt4c2al/36746012608.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/16428782775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=letra+de+la+cancion+parando+el+tiempo+new+yorkPDF 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_off0000bc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6B 14992 bytes
SHA-256: 6fc7581c201b022026bc5f606d1652706bb63f03472490bda545c546949c5b8b
font_01_sfnt_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 10756 bytes
SHA-256: 248bc121d3f316f669938b4343c435ef95da5d4211c010cc633c2ecc350dc154

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