Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c3d002754388f1…

MALICIOUS

PDF

83.3 KB Created: 2021-06-30 21:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ddb510075a469aa7ceb8a6947ddce260 SHA-1: 9bfa0612856448351cc29298ac72344cee45851c SHA-256: b3c3d002754388f1d2ceaa95dfabca81842bfd5e9aaa1d151f8aea29ca672182
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. This structure is indicative of a link farm designed to obscure the true destination or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1db962f64---jurodadovomemikaged.pdf In PDF document text
    • https://stillwaiting.org/userfiles/file/83746047623.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/repagabakupupalepeweb.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82c672d4e---57431995615.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/kudimomijunisoz.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/8512746457.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/be114ff0a52e1a8dacfea9992589fb64/puvoxe.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/b46b7e9858607a58ae211a688a74aa01/rovakujomeb.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7f20fa9128135b92358c7ed7016a540c/93511553772.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf78cad00---4543371452.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pughcd8t4ufsqker8rfp078n5c/92399616320.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/73744939143.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fnaf7gash2t6jl5bictq785dma/34385859040.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/6a99ec09516c9133146a849f5dc67757/perove.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/09od4st9pk4mtinb8g2kv9557j/morexopaxiwodemakez.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6992d29c6ead9ddb606d3261447f66cb/16691999849.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b81bb9c1a8---94288711808.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/351c658cf3308131cb7e0bd98b0fbdf8/warasexuw.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/uahhnnvd3r0afupbiutnbne9q6/runotiduf.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/417235bbcaf419e9a136806cdda8bfb2/jasibupana.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/2e99aa09c463c53116e1267cca41cba9/modiwegosojixaj.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a30596d2692---bugixelel.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1fe09e00a4324ec5d0191ab315b27c53/46185852289.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f5990979f---64728049536.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/71f00ad97ddf19d15b428a45068179dd/lazodixojolaz.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/89551091812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fractions+worksheets+grade+4+with+answersPDF 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_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 10836 bytes
SHA-256: 0fe3451f6b0a0e7e9c938c5698deeb49ca6520d7b22f52ef72d3f85049cacd59
font_01_sfnt_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 16480 bytes
SHA-256: 41329ec55bf6d1f9d7d5f854051b2503a0728a6e495102b70fb7893836ec6ad2
font_02_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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