Malicious PDF — malware analysis report

Static analysis result for SHA-256 d497bbebfc080026…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 06:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0850e5094c2ced0d0d497ebc3f2f9fea SHA-1: bd5a3774652644a37b709a1b348d6f8c18fc9ed1 SHA-256: d497bbebfc080026a96ae959df8d5cb72e11b99671a1e722a3c582c1506cc8bf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=comparing+adverbs+worksheets+for+grade+3 PDF link annotation
    • https://www.fangjin.org/ckfinder/userfiles/files/539935330.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/tefugoxuzidapitofekaj.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ef7866a6b---pigabajifijobozeje.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/digoka.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/74379265939.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/raferugome.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/afbe5b73ab4734145da135c18963fe8e/gebojimozitufarisuxedij.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/xiwolirosogekunon.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2ab244fd---56323048746.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70c85df21---17840895582.pdfIn PDF document text
    • https://anaksemut.com/contents//files/sidarun.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/jalele.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095c50c770c2---zibuje.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/nemit.pdfPDF link annotation
    • https://perfecthospital.org/FCKeditor/file/tarewanerutipe.pdfIn PDF document text
    • http://stroi-sistema.ru/img/wesagigupupepoxonal.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080386d8242b---68572658191.pdfIn PDF document text
    • http://henca.com/files/details/file/79866176707.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/o7hv94kqmeq3ufcqasanvn0e07/jivaniwajavogof.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbff92fed1---89304467019.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/kmfst7jmga13icvva273s56q95/jagowinamoxugolo.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/83229940158.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/3593188416.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/fanovokaxosefe.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_off0000c769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 11488 bytes
SHA-256: f816beb838e85b301add465a127d547a3b3a549f9444cc987a7a4c796014ef24
font_02_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 16612 bytes
SHA-256: 12c3ee1291741b26708245d3da415517e5c78e65ff1d02028f26394b406b2866

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