Malicious PDF — malware analysis report

Static analysis result for SHA-256 417248c119ccddb1…

MALICIOUS

PDF

99.5 KB Created: 2021-08-05 11:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa3678d2e10415ddd96b766331f6b1cb SHA-1: 44ef9db2d33c592d820f294dbfbd1e09fe5b0827 SHA-256: 417248c119ccddb1d96f9a9259e7330dad28b50c38398f703584f8126d55c0f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sowa-architekci.pl/userfiles/files/18439518048.pdf In PDF document text
    • https://rybczewice.pl/userfiles/file/witusunexepivu.pdfIn PDF document text
    • https://okvino.it/file/70923121958.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/borobabesifaratu.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/turusupapiganoxiri.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e1ae0c2f0---96411263514.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103847a4ae07---gazogojupunu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f7c62065933b30e720f071b6b43b61be/94036625299.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871b843f3dc---tepigugulitanoti.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/topesigaxewugomijala.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/80258787437.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/femukudimed.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/tekaselutelelarolojuzado.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086401b00c45---lukiveviwizevulodav.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/wapewuna.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af400e3afc0---40661635416.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d1cb54e148105228ad5192db8b6b559f/95515487991.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wodamurugabuxanijixi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dd992936b---82099011483.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb7bbdc19---lodavetaxovitajezajulolan.pdfIn PDF document text
    • http://besteva.com/upload/files/dalazemat.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c79f67e18---salefezuwuvoguregupi.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/48994673906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=one+punch+man+temporada+2+cuantos+capitulos+tendraPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 12304 bytes
SHA-256: 9a76f339d7f7582c0b39dc344166d250c06287008b28fc3d40c1c688de77f82a
font_01_sfnt_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 18660 bytes
SHA-256: c16b83ced8acae56e1090f8a71465971ffc0bc6c2edfa7ce83c8b1c00f5e01f5
font_02_sfnt_off00014b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0D 11024 bytes
SHA-256: c5710a41bb4485c2b24ca54f982b9b8f9990b0aa2cc33b0e601447a0041aae69
font_03_sfnt_off00016490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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