Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb277f5294d4ab83…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 17:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1e34121084b4ac42d21591ad5a6c6a1 SHA-1: f85971fbe674f50bd351e007ab061956a8f4167d SHA-256: fb277f5294d4ab830e576bd1d811a1219c744affdd68febbb06b1a332861124b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing for credentials or delivering a secondary payload. No scripts were extracted from this sample, but the heuristic firings point to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fasaac.org/temp//files/73160656665.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/187efca8a222655ab856c4361b47646c/xirezaninajapisepo.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/gedopezudusenagemonegeza.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ftarkhran9lr8i6ctqonlqveo7/zalevivu.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/benefojap.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/20505542560.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/pelipawudeminubiker.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/sentf6qo71552c34ebjir612f3/14027271463.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b34cc88d---fokogubevaw.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b093ba1d9d3---mixaguwaxeb.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/vujugotoxeselimate.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d40ff02a6c4c1e6f4fa89a4b589525da/44789857233.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a96a6199b9b---xobixijoduvilusok.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/h0j25sr51k5bvcho2l9pi55rrq/temuligadusozavi.pdfIn PDF document text
    • https://baongochoa.com/upload/file/fadetej.pdfIn PDF document text
    • https://khanikango.in/file/xulinebubaxo.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/botedavujiloledes.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/064c077f5557f2b32e6eff3a8095c76e/minelasimagunewitu.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/afc675ab8f836975ef0f0c49f9f142e2/54136978964.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/94974808591.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/lepopitenonu.pdfIn PDF document text
    • http://goldmustang.com/files/files/bokukivulolizosobijopul.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/78dfddd5f8d31457db205f381177bd83/58384000991.pdfIn PDF document text
    • http://rsentco.com/upload/file/tuxubetarujediderejogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=comptia+network%2B+exam+guide+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_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 19104 bytes
SHA-256: 510386c5a0015f2fd836234b9066a888e19d68645c2343852265455d00570525
font_01_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 11036 bytes
SHA-256: aa40879a4a400b0edf54a1ae6d01c5f656e33ca1cde72af85e1caffddce763b3
font_02_sfnt_off00012bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1