Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e76ca57bb68c44…

MALICIOUS

PDF

76.1 KB Created: 2021-07-24 22:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92ac041acd6446933170279082963e0a SHA-1: 441e87cba4eb5ca8fc6d7aecfbe1581c9edc9f94 SHA-256: 66e76ca57bb68c4422c7ee759b37cd2e38616a523fd909d888d191c834dc4339
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised CMS upload locations, suggesting an attempt to lure users to malicious sites. The document body was unreadable, but the presence of numerous links to potentially untrusted domains supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74cd1ba9f9---22113760922.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070646ab29da---rodadasulel.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607307cadb395---matagu.pdf
    • https://etonbio.com/newsLetters/images/file/72489176850.pdf
    • https://suprizpin.com/calisma2/files/uploads/88243209118.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/37207239570.pdf
    • http://yuhongzg.com/d/files/dasiboj.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d7edac4a---mosufigux.pdf
    • http://chronocertif.com/userfiles/file/69101086521.pdf
    • http://harchovyk.com/userfiles/file/xalarijutubomigo.pdf
    • http://myxroad.com/upload/userfiles/file///valalapamab.pdf
    • http://crescentcarpets.com/userfiles/file/85993034273.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba41b7d40---915620264.pdf
    • http://hookmyweddingup.net/clients/73542/File/23906194381.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d31930add33970f3b998b7b7517e02da/22044737046.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/ea69713a4f710c48570929ba2cbba6cf/31386062893.pdf
    • http://erbamedica.org/userfiles/files/dakera.pdf
    • http://phillipsbricksalumni.com/clients/56168/File/86145039759.pdf
    • https://noithatkuongthinh.com/uploads/files/babapubazoxizebirebo.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/07d5fd80f4667629230f13538e33f2fc/sisupamezilezonegal.pdf
    • http://www.firengo.com/userfiles/files/tesifekajasezojew.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/72227516076.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cb6479c9cb55f5aaaacacb4abb72a04c/lebezejoginegubosix.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bhj00v8m8dr2n5veclplij58n4/mufemodo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fractional+distillation+of+crude+oil+ppt
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c996.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC996 16792 bytes
font_01_sfnt_off0000e1ad.bin
eb0f45319b58d46b7112d2f27383badc8f3164e851ce5e92fd1b389435d7707a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 10688 bytes
font_02_sfnt_off0000fa4c.bin
eee4f4db50fb9fe827142c69418664af629beb94e40670b01ae1227075e23150
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 15364 bytes