Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb2f5881a58c91e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-06 17:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06c1e40e7fa1d3a4555a05664300321c SHA-1: a5d752c8675a0cb87cad6a0db06a336b10c6a291 SHA-256: bcb2f5881a58c91e1a1269c9f780b398af1d4cb6b496a232a7b58493f1df9d38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or exploitation.

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 https://dalilak1.com/userfiles/file/75109584412.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ggb5m6rpi5u77e6h5e27ujnrq5/fetotafabukokifi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a282b68fff9---77024767233.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/80560886612.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/27421797987.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1624262673.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/43896271929.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/630fa952c118015c10b4e96674ec83b3/xalufibeginiwizanuxisu.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1659e458a5---kufiru.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/35620897832.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109021736432249.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/velevutoxik.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/f58b4d30d2763ccfc74343551ef00d66/kabisetikidegulupomifav.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/39065884719.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/datijijemurejada.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/tudifupagaka.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/3232327821.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b207608e145---kuzerivexopigizum.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f5fe27499f5---forotitaguvixoxewube.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b793b1f1ef1---zijazi.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/65461065141.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/50993632517.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d317fa0403---gizajavovukafakelawi.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/70289560780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mantra+pushpanjali+lyrics+in+marathi+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/livavikusapej.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_off0000b2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 16264 bytes
SHA-256: 0a4b7d4738f73657b45bbb20d061622b5aeaf3a6480717c98a1bca0f71209b1f
font_01_sfnt_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 10968 bytes
SHA-256: 638403db2e968b9269645d72c67465aab5462936dd8fb038d6e07869168df5db