Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c5222bcf59b23a…

MALICIOUS

PDF

95.6 KB Created: 2021-08-08 17:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 49d16a05f2d111eee0f180f8bebe9c5f SHA-1: 092c47ce4038dabee1e601cb73e6256bf1d193f3 SHA-256: d2c5222bcf59b23a2fe0fe30c0f036a01367688d3f0c4a4f78e99f1c0f7f3be4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://praguetransfer.com/files/file/81207141209.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4431e9a89b---51878331631.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4518c524b8---basujibosibovuleliwes.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8v97m4vfl9cbce2qivu2j7jcug/47790806811.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2fc92cd6b---joxojuzole.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/gorililogilogodugopim.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/5389270231.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/77417731980.pdfIn PDF document text
    • https://combrooncom.com/contents//files/xirelebopajawifutep.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/kofigifonejafadi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c2b914ebc---wogunurufid.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dekatamejefupexowozu.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/42292105671.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/63531727898.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e76bdd3f953---66664443781.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988fce3018d---ribasiniluwuwomukopafita.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fe2ca4148---kubemi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072c89ce95d4---38478750020.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/dedukejinibopusumukemor.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/6f912f00cb90e1258a87142c49c3800e/pebuwebokarujipamana.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/274178bafaf45127753373401c37463a/benajobolavunoli.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc49d65b7a---75805623345.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/27479854880.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/tanon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=brainpop+communism+quiz+answers+quizletPDF 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_off00011015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11015 10980 bytes
SHA-256: 7e0d9bc753d645af4ad3d3262bdef8ca5f4cf4108369f48a0d3b2ee471ccd2c7
font_01_sfnt_off000129ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AC 18292 bytes
SHA-256: 3821dc42016e3382d234816e4bbf197acf913da5656fd2e2869baf0a54a0a549
font_02_sfnt_off00015881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1