Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89b3d15fe6a5e83…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 17:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71d55185096d2812ce291c72cb6dbbe5 SHA-1: 076a510380a46376e15b0bae6a91af8e0474120b SHA-256: f89b3d15fe6a5e83331ccf22e5f15a37489f0ff51f11ed3913ca2951d4531b33
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to a malicious site. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://crewmak.ru/uplcv?utm_term=shareit+lite+mod+apk PDF link annotation
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/muteposutazofumupopuzodef.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/17942277625.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b747c1f6049258ded6e261fc196d76aa/14684828885.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://modernplating.com/userfiles/file/gatafukesuxiwigozax.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43df0757d---75975755240.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/koxabixuxinuviwepe.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/67919430633.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/13530309283.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/29634690021.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/32026227502.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140215f41773---vilakati.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/xuwedilowuxukow.pdfIn PDF document text
    • https://krossi.ru/images/content/files/17207046836.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/bikunobumebokamaxe.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/mitoj.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/s5vnlhln3burs0vtqn28ufue16/10586352563.pdfIn PDF document text
    • http://mebco.ru/images/file/64266587323.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/jimazawefo.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/daridusizagitib.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/berol.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/levexose.pdfIn PDF document text
    • https://photojet.net/userfiles/file/petedazoxirupunaf.pdfIn PDF document text
    • http://deforma.it/userfiles/files/59435793904.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 10552 bytes
SHA-256: 9dd14fb8a57c6c0ed695983b942b68a9669ab286d1bd75ae8111fa5351a0431b
font_02_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 22188 bytes
SHA-256: 12f03a60f5c21a3c040edbc35a875868a1de214271de729e184d2b35f3e841ad
font_03_sfnt_off00013b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B31 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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