Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b70c626c860536…

MALICIOUS

PDF

86.2 KB Created: 2021-09-02 03:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d86d7a60498e334c728e640c4bd80006 SHA-1: 8c06500707a6f5123d7e8203e6ca46ed2a1d23ae SHA-256: 41b70c626c860536eef178bc73d7b69a9dcb412b292cef57d3454b1eb046cdc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to other sites. The presence of compromised CMS upload links and disposable hosting further suggests malicious intent, likely for phishing or distributing further malware. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crosswaysrecruitment.com/userfiles/file/26449672411.pdf In PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e4145460---demiwogubugorisajokodide.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/23cd8d7e293dd2f0fecbd57688b46baa/pusimobaxoniteg.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5c4927064239f35de981cbc03eb546ef/82570084355.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/zezuserovudew.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/889b5caf0f11e91e1151292db7d32c3a/82451171739.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/pibalotitekojokon.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/sarukiketazajusume.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160952b30f1537---84894263251.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/65698976402.pdfIn PDF document text
    • https://micsys.in/userfiles/file/luziwib.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/3sb5nskrfi5br18mugpvfrm1nh/pupivikovukaju.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/laloropokixekigisewovod.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f52e37e4875---22150863015.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/xaruxowogigujave.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/664cd39937c944ee2e5fc45eb420eab2/41792087140.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/64889978080.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jomjgho34vptfo3sk5t6seek9c/gaxar.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/aa1039f6caf7c8b7f8263336e5e51f47/zogipuzejagukexer.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6romsejpb6eiaueiu7vis47rk0/70302661437.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/demigoniwos.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/pibimuzujoruxado.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5acb97484f---sulofejibi.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9074b5ba4a---78533944226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=a+remedial+english+grammar+for+foreign+students+answer+key+pdfPDF 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_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 18160 bytes
SHA-256: a1d1160c9795ba88b160eb831c5e5d5af3df27bfefd0338e823ee365d43f9c91
font_01_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 11320 bytes
SHA-256: 3c0e48f1bb5e62152b1eee41e3dc76f2b4976af38fe73eacba5a863fd3703c84
font_02_sfnt_off00013183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1