Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bae9476b358c50…

MALICIOUS

PDF

83.7 KB Created: 2021-08-19 12:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe3013db76686a70fe07ede10b96f2f8 SHA-1: a7c7057dc2832c6fd82278261374437e0eafffcc SHA-256: e3bae9476b358c5050c7d7d6f4c3304585fb061d04f33eb4cdcf922f50ba0822
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt at SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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://synerhu.ru/uplcv?utm_term=pokemon+platinum+nuzlocke+rom+android PDF link annotation
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e5b71a08---sobarozolit.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/wufotulozakisazikefuda.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5dpficp224k30gmcalmmqf1vd7/36395810498.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abdff955d20---wuwetekegixefus.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/89068576871.pdfIn PDF document text
    • http://fgosvo.ru/files/files/21696954455.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/lojoz.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/2vgn40b8v1atmhf73qg6coofnh/2452609767.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d17382bd---17767321468.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b716a8dee5---60657791900.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160915a13e5127---wilisit.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/wifeselipu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/oqbs6jhuucpvldta32q8nait46/39482058245.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cf03f2761---niwus.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/s17veplla95i2p8p3rsa3hrh8i/selulazefibeluvofo.pdfIn PDF document text
    • https://guijek.com/userfiles/file/molewumu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/mavevezo.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/13996224757.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7b7374f53---98323993810.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f5b862974e2aa353d403fc3247b36a6b/50053382048.pdfIn PDF document text
    • 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_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 17056 bytes
SHA-256: eedcf1f4fecfd3fe1db68fde8532b360b7f492101dd7ea09a6f19714db0c33d8
font_02_sfnt_off00012612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 10760 bytes
SHA-256: a773e68092cf027d95c0d34d1ad5e4e2b8d066a5dbb8ee15368ed27f30acefbb