Malicious PDF — malware analysis report

Static analysis result for SHA-256 628fd018aaf89c84…

MALICIOUS

PDF

94.2 KB Created: 2021-07-26 05:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a784a4511b8b51fb8d122429801a22ee SHA-1: e21b1bfa37dc1823f6499aafd6715e8adf3d28ff SHA-256: 628fd018aaf89c845ca0007a0265558f2719c3b00030ae511b76e7f9a7213ffa
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS upload directories. The primary attack pattern involves luring users to click on these links, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tenekedjieva.com/uploads/file/59512823476.pdf In PDF document text
    • http://bluekeydigital.com/images/pic/file/88914098338.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/40182500405.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e921a693b---xobavusiginepoxugejok.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/ranosaluziwujupeneter.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/85889841298.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b7408efa6be99555b555127a90294f5a/93591260240.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/2755898120.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/bosemuri.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4c20019736cb724be4d31a1313627639/97141911569.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0bbe0a28---bixisavi.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/73165309237.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160984257682c3---dipexokimitowegupitesi.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/seneliwuvizaref.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/38706794448.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/sasaxid.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/30731984480.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097ef27c4a57---tepafapegug.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/xezovudurakenirudame.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084193e3cd8a---6732426733.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a200e35d99f22c1aeb40f9baa5853abf/84352906075.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c67345dcf2a---10089079408.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071a20a5ab4c---42791795349.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160768862bf725---lewufaselojujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=puzzles+and+survival+best+4+star+heroesPDF 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_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 17596 bytes
SHA-256: ec99b0947ba8e41363b1276a96d7fbac5b26365d409cc64a7142e99e624ee34e
font_01_sfnt_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 10788 bytes
SHA-256: 071efa8b2a0cb968ae30e59b66e81e321bf0e884510185440745ad77bd61dbb4
font_02_sfnt_off00013d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15539 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46

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