Malicious PDF — malware analysis report

Static analysis result for SHA-256 52313068698af761…

MALICIOUS

PDF

92.4 KB Created: 2021-06-28 19:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad31de5a793cc8c81f04f92273a2589a SHA-1: 8f468422e0188b41f771abadb902fe278a146c9c SHA-256: 52313068698af76120e01a0f99a39cc45c79555fa0b351bcd3dcc329d6c5c885
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa513a9053c---45091926717.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c0d9bbc8---zojotoxozoridim.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/66384b5bc4f3b242f04b867d50f926c0/mumivorugewulov.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607233cb2654a---gijonimabovezifojuretig.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b115fed0c5---47705175979.pdf
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/46225119317.pdf
    • http://firegallery.ru/img/upload/23170046380.pdf
    • http://aggengr.com/uploads/CMS/file/bivowogudisoxovona.pdf
    • http://karpatskiles.ru/store/files/fubuxotuzevi.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/7feda08bc31b3a9ced81f7d80ec6dbb5/bemitevo.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/fd457627687df2ab3328d48db3620f49/2078378006.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c27479016---kijorikiv.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c615d7233---lazugawexetejoluxulowolux.pdf
    • http://ingenermarket.ru/userfiles/17928268985.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/bbpijfika8m1f8tff5gak6hvrm/muselugagoxativisatof.pdf
    • http://thingsantiquesla.com/userfiles/files/jiworujutepeputupiwi.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76cbdb30e---30514708265.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/m47ntp64aodfini1v7e7dh289c/1056409190.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a4424b622---jemuriwawubetodixepo.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b298246a41c---64026525701.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a882e6ca1a1---10791715813.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/427aedef31a2253b0c64bd9cb4307e17/51338626473.pdf
    • http://booklandbooks.com/userfiles/file/22202815209.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-25/20210525214925394320.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dialogues+of+the+carmelites
    • 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_off000103d8.bin
1fdd78ea7dda11ec23643d2a735f2db9f3bfde61c7dec0e550bfd00c1c964801
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 18316 bytes
font_01_sfnt_off000131e4.bin
09ad2769cdf49ca34eb95a83aa98106878dadf768f4fec4211cba6c91242015a
pdf-font-stream PDF embedded font (sfnt) at offset 0x131E4 10780 bytes
font_02_sfnt_off00014ac5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC5 16792 bytes