Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb923e136a850c2…

MALICIOUS

PDF

77.3 KB Created: 2021-09-06 15:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89bc7fe3cf5b801531cb29aa4258b8a3 SHA-1: 09955dc4368acd663eca233e9c4a1b78cbfde779 SHA-256: fdb923e136a850c2f1462a98516162492d1b6891bf7ed3a4cb5f3ca7a123f7f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users into clicking through to malicious destinations, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lumieretvie.com/userfiles/file/rumotivenagemawimasigepe.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/810121b3871449b0dd6234e6775c0219/89914217656.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/666041603a6d1228256078c0101fd47b/folipukit.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/281851b38d84922a4f52ea4103498d83/77923473997.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/lofezise.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/o353q6t3uignlg5er0sljp5khp/1041650683.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4613ccbfc---4375775885.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/wekepesovemelib.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/93457689686.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sudekon.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/61918d9531c0ebe96e9cb139c7cf36da/bukoluguvadeluboturi.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/saduni.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/zugaxizupo.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/ximizefapudupiv.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/hih6bqiaf6l96ugm3pa9n32au0/23407397820.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac775f9df17---nakusutobubunegapex.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd607deef4---55391414592.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ebd3960e7---gusisowebuv.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/54556220553.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/jozimogogex.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/69186702144.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd02bd88a68---69422455978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=advanced+plc+programming+examples+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/wunadefakajujexawukevame.pdfIn PDF document text
    • 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_off0000c3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A3 11012 bytes
SHA-256: f7435806cb32fea85379c95067bcc6f3fe1210600f7a102ef3b53a94dcc9074c
font_01_sfnt_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 19548 bytes
SHA-256: 0f7d94c2e11b735019955bd4dd981a5a79ca1f26d872251989e7329508792136
font_02_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.