Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b346f4aa0e6e6f…

MALICIOUS

PDF

144.9 KB Created: 2021-06-25 01:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7e8411ae8ef7f43a5460ed23b30cbfae SHA-1: 60308812f15ab39fe03864c9a928c67a96f601a3 SHA-256: 33b346f4aa0e6e6f9f8536ae804bce50dcd881b3b2003eec0df053b8ff0b78be
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/c3fc365cc9b44c59c416f90b8145dd49/nenujonexuferuxigamapur.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5fdc3a18e---madimupiwopidedajuw.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfad822cae---82724482331.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/cb91d3e5d47054b0c3496a1552f56db1/19740876259.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e03190bae71c6fe426e9674facfb4de4/tukigaf.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/vobapaz.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ani4ojeun21ig9bib8cgu3kds9/4786509934.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/xajizifaxolanuxatojogami.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609661d9e6dfa---voroporada.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/85138951031.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zixizipujalutiwedonigato.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/jofapifunugakake.pdfIn PDF document text
    • http://wenxuezj.com/images/File/zabasugujidoz.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d328c2272e---pivafonemivel.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/b4f21a60cdd1f212113325a85c02f5cc/82425179408.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/42674933280.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nasowakovokelebixof.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/9dl2um5bs2i0etsertt96p78c7/94661694207.pdfIn PDF document text
    • http://htwy.com/upload/file/60992063965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=glencoe+introduction+to+business+pdfPDF 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://scripts.sil.org/OFLIn 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_off0001e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E59C 5112 bytes
SHA-256: 3b1296dd837f1b2b89f4ba5b20efdc9d0d26159c6a2c7b69089b6b543949098b
font_01_sfnt_off0001f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F70E 11860 bytes
SHA-256: 085b20be51fc94d6375d57aab414caaa5b493bf3999dc6b301ac0aa55e484076
font_02_sfnt_off00021f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F53 16316 bytes
SHA-256: fd5214f9c1de6810f7deaae8da77aed33cb8fee5e1bbb1c11ff70ad844825f54

Open this report in the interactive analyzer, or submit your own file for analysis.