Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc65a06a77a8a25…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 07:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f14d6dd518e6643b0889e67c7bf86264 SHA-1: d780310b46a8c7b8744e7f18492435bd847cff3f SHA-256: ffc65a06a77a8a25ae640f16feaa925e0044a1459e14676226ae2be0af00e2ab
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, many of which are part of a link farm. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or scam context, likely aiming to manipulate search engine results or redirect users to malicious pages. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crysiq.ru/uplcv?utm_term=icse+class+8+chemistry+solutions PDF link annotation
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b007db3ac33---kumurusuw.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/86723523526.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/pc80jnvpi0l1v323g1ntabqbnb/79349291127.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ffdca5eae---68907190808.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kaximufagetu.pdfIn PDF document text
    • http://cwesp.biz/upload/file/8315457792.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c962389537---zaxop.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3d9593231589094504d5558c45cd6c3c/tagonu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/o3qu2gsepla71gd1t6jfc5v5jj/wuzorerena.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9506ac2a1---wekovegujasupulipiwu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f88fb48acb---kimuxiwoxos.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/97364944378.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/o5tejhfvi9k9i2em23thcqipv8/lurefadutatuf.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c499e66f6ca---bavemabamatizu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c734b3c3847---78202626863.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jjala2ntpmob7ds1eqmp5qsr17/89897508873.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/loxiropu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5d5454b07---zubuvalidunejifi.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f95e4cea5---sokofuxarerasugojibelo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f280339c660c7e51768ac44e1a07d47f/82080164296.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/sbhqg3gcum4jdu72v7eq5rbr50/tubaropiwizoze.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/1422760537.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/mavizeku.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfe21d2d6---16925084519.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d556bc4c3ca---wupitafoluwid.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/3fd3e39ba61688d317b50d1f47688648/letatonolebut.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3151c7c843---juxizetetavijutafopabufa.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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 16908 bytes
SHA-256: 63a8ff47fa637150e2e954d5aea6ee92e24c5a1b8ac1487a58f71dac4119d9ab
font_02_sfnt_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 10868 bytes
SHA-256: 01ff759df94595acf8b5d5549eedcb5e4c9dedbc86736a7403801cdb766aeed4

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