Malicious PDF — malware analysis report

Static analysis result for SHA-256 593ca11feb38dca7…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 04:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 143e8233b6254ce7bedc4d776e50a137 SHA-1: d9d047d11e99f688e052f0c040d264f8b88d00cc SHA-256: 593ca11feb38dca721307dfaa1a571f1ac3de8f05c717e75e5714a005bfb384b
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF's structure and embedded links indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://agama-rc.com/upload/files/95782929183.pdf In PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/57082695622.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0dca6ffe---75127691946.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982193f31be---18235524635.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/mezesopupedumutafolidolaj.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb5592a57---fabugixikinerivovedox.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/50079661238.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/h9u7ncp1hi0g8kmhkoi9jee33h/midevujazekijererabozun.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/96311141306.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6905b388de37bc1eeccf7f38f889f07c/modexuzovejamumatoki.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/730sgcdakue71nespgp75bsmtc/kevaroxapoxobinir.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d24164506e4d48526b9e809d50ffed94/71994277954.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/46fb18d224d6cfbb8187a51dc51bdd27/5601208215.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/9d9c4e5682d6a3ac1ceee80d7201c834/tusazadolixezozateduna.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/oqg8bq4504ndhhfv4sgpjs29t5/pasepul.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/5q7m293o9nke2qaqoaf5bap6bj/8564193181.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/89a08c90dc9d76e9798268613591fc2b/josamulurenariw.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b5da8ca33---seloduvikivosewowufuwa.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/99376678682.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/223af0c22f8e19b8c6fd424669389bf1/70348602433.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/iq4m628q3davhm0lkktljpr6a6/87309726364.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/vemovigosibomaboxaza.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/2147037350c0d0989b18f253f399195a/fiwarifizipi.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/netim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hero+from+dragon+quest+11PDF 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_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 18020 bytes
SHA-256: a56b621bd26a12f8c0a4860be3f249187cff0e1a9dc5031cd69e4cb05f52bb45
font_01_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001348b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348B 10848 bytes
SHA-256: 84422bed3d253ea1b09c467939e22127632a71d6db67c8bc6ea974f9ad4497bc

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