Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a66fc66c7026d9…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 00:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: aec873100178e113af34f1f66c1c6a78 SHA-1: 1fc6a8dc44160c52cb4213f8c894e71b64add486 SHA-256: 39a66fc66c7026d9f49eb86f30fa8e96231e02e354d6be0e1d23e2af12483c0c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/737d5ec54907b21404d25b9ff84dbaec/38502592410.pdf In PDF document text
    • http://beachfirebrands.com/userfiles/file/76328530800.pdfIn PDF document text
    • https://keongracun.org/contents//files/93227495610.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160877d7e3e095---90397874018.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f259dc00c5---99102921036.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/71641121323.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/deloropipavixowuxopa.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d73f2ce79371334e473b8747c1ccaaf0/sonokuxalewomarutezozawo.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d74b04371---32380396597.pdfIn PDF document text
    • https://samowar.me/upload/file/joxamazekebofori.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/rikasilomawaberawo.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/56171197624.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/acb92aa891ed98cab5c5dd2c74718a76/54420871563.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d43bbe30e---rularedagakosutela.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/tibusufaleduvesanote.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/a8c0dfc81248b3939a3404668b23f4d2/63175485489.pdfIn PDF document text
    • http://turbooto.vn/upload/files/36296553095.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/20790861683.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///66326819779.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/79712989334.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/97b8bda6ace7d179aea7fe067cec97d1/93069884274.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160bff858769b9---58246289825.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/65222222722.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/42479936088.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3215ea1c96aa079bef4bae7f826f6d8f/18696037146.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/jefokexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=types+of+white+blood+cells+worksheet+answersPDF 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_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 11112 bytes
SHA-256: d8563cc8c99854c2a2ecb8351952873a8b289875b97cda70decd0004173ac3cb
font_01_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 17200 bytes
SHA-256: 30d2ce539cb837328b4db8045bafb966a7a2323b26ffc76d122cbd35720991c4

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