Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1fbb5113679af5…

MALICIOUS

PDF

75.2 KB Created: 2021-09-30 16:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 967f6ea5eb1db545970ea823d2d809cf SHA-1: 4554052fa2a5128641794e6f88c8e109cee19c13 SHA-256: fb1fbb5113679af51296c6e41929604bc1593a5728c0ae3fb115701353114681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/604d65149139b95b4912c1533f56b3d9/giwawutepivilef.pdf In PDF document text
    • http://efuturesthai.com/uploads/files/wurawobesaxexetut.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/67877960823.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/98675315068.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/sedulumawowewotug.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/q1q28ldb9vsvuesp7ai1s4hoh6/17493039014.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/68656368387.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/xowunekuluguvibepusurur.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/98489685681.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/govekegovisiko.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/susetabolimegenewunalile.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///jojola.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6b2b318741e4cbd1ebd96cb1d9515470/86629137514.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/kilugifurowazuxefunulu.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/85344928129.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/kitupimedoripufodo.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/tofowu.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/jajeradomonowega.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/32882345789.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/59321506485.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/87090651670.pdfIn PDF document text
    • http://wwstationery.com/files/file/kitupagivapaj.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/88298840079.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/48819231672.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780b8ac9ae---12991996788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=trasferire+sms+da+iphone+a+androidPDF 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_off0000bffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFB 18116 bytes
SHA-256: 23a3f0fa1b4a87ec9ba3fefb1db30dbb38288a3c3282ee6eddcde21bfe963d9b
font_01_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 10580 bytes
SHA-256: 444a7559de75875626dc65d4526fe0f212f20ad295d5eb9eb4553ee0a213ef64
font_02_sfnt_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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