Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ebc878e11852c4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 20:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23b7aef63edc47444e7bf0b7269c31a8 SHA-1: 2afd5d313d3d72c728821cd471aaa0382b90862c SHA-256: e0ebc878e11852c420700c8b4846b9f447aba295fbf5fe5eba5301c7264e90e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=english+idioms+in+use+advanced+2nd+edition+pdf PDF link annotation
    • http://banghaija.com/userfiles/file/selovisagema.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc0f188dc6---98682570615.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/bje0mqc1c9qg2l276ilpcdo7b3/11444614514.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/93f3a60bd31edb9860d7da51a52ac886/31724063246.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6cac35a3e1db08567aa80a2998f83fb1/59513743363.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3a0f1a9de1345efdf437d0f9cabfdfd4/65204466311.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/misibibo.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/18767475918.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/35605047702.pdfIn PDF document text
    • http://aquatherm-graz.at/files/wodetuzawaredetov.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/5u07jbo6m2rdqrhvha25pcmmv7/jedevovepopuzixek.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a831c44e08e---wurafadosuxusovakodufit.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/36972568047.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c643f96f8d6---73636501993.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ff80d40d---25828751570.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/pofene.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d438505c64---79729442057.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1610061536147e---nikuraliv.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608507b9b9756---jonixanutas.pdfIn PDF document text
    • http://heizler.hu/files/file/pemaweroluxoruxilipelod.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd143790229---nekuxadojaxamibeg.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd1e48859---47390959581.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/47464727603.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/gisoxokexilejupaj.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_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 11236 bytes
SHA-256: 8b5c91485a54f2ab908a236064b5c71fdf8df2217a008ff1d91f4704dc788360
font_01_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 21752 bytes
SHA-256: 13ef362517fcecb52d1b6aba9a4e68a63c3ddb973803dd88f64fcf73ab1a6a0d
font_02_sfnt_off00012bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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