Malicious PDF — malware analysis report

Static analysis result for SHA-256 3842013a52d8e833…

MALICIOUS

PDF

87.7 KB Created: 2021-09-20 04:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 470a49049fcb35528009389b2c828bf8 SHA-1: e888f55beb7a3c30a94f0ace8209df33d1152007 SHA-256: 3842013a52d8e833a1c90c36827341eb77be034ad7a53107d3d2909b173e24c8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs, many hosted on potentially disposable domains, reinforces the likelihood of a malicious link farm designed to redirect users to harmful content.

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://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375fb39143d---44370810419.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/lrl8brmpaq33op6abvdjdkickq/33684324928.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/nugage.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161395d45d6ca7---nidamajesomojuka.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/cc652369ddcc38de50441f4b576896fa/zupadavixepuma.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/54101139093.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/36513444430.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109161806499117.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/26295930569.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/jaxerukawudukapajovus.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/44459964845.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3b9c1c22cdfa9f1e812e965aadf2ef3b/3520686458.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/18810627093.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/69267757086.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/24625550612.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/94922246433.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e034ff7f0b83982d7bfe8af688c044e6/4716360822.pdfIn PDF document text
    • http://aminotp.com/upload/files/98001025714.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/55294301000.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/85617224896.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/90586591553.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3bf916d39cc924ef976ed11a3c85eecd/bologabapekibepupuruz.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/dilenofusopogexu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161470c644d30c---ritozifizidanaril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+android+themes+appsPDF 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_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 10588 bytes
SHA-256: b818a624d94a0f82db6363f55255a50195ac782e2c6b24aaea36a1889bfaf604
font_01_sfnt_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 17604 bytes
SHA-256: a8639eb9b0b84aaa501f2a12cff61665f54cd9c1a9fb3ff86004a133daba6396
font_02_sfnt_off0001395a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1