Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5299c85999cf68d…

MALICIOUS

PDF

86.7 KB Created: 2021-08-03 08:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb3e2a676a9a05c1ed794275dad953ec SHA-1: c04273bd76bf56bc231233e7bb35d7d5f772c773 SHA-256: a5299c85999cf68d479fbc6b41776b628052b36c6470286feedbd6c4179607c3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links to PDF files on potentially compromised sites suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0rojhenbbfl8iq64guafn3qog7/mefilukuneveloze.pdf In PDF document text
    • http://grandinspirations.com/clients/75274/File/zujisurufofutidesotaxuv.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/dokij.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/87703197630.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/nasigamabosorotitafekuga.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098334b1aa36---6850292976.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/pekiw.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607221f55cb86---kudelivemiwawogoxujipaba.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/rezodejupegivifu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16099c83c9dd72---47494561907.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6828d6580---tuweridosududugeromemukoj.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746be118aa2---rozusasa.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/51063327040.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/ripabanuw.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a922fd9e34a---pusidudaxu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e79ff5966cf18660f68c787181e4bd86/28221743843.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/99053572846.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/fodejasevutaradizasepufum.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/jajenujozimogeki.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/dirofewajom.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/6641456884.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d99f8ba9036---zowotuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+order+dominos+onlinePDF 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_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 16536 bytes
SHA-256: 57fa573741a9349087f74f7f578265119f0ffa1a45e7de3a8cff416f276d9997
font_01_sfnt_off00011c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 10556 bytes
SHA-256: e704e6ad11448ca69a3a3f1c33f6fe2ff49ffd19fa274e4b8989116c97a77acb
font_02_sfnt_off00013479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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