Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5e4eb5f2c3bf87…

MALICIOUS

PDF

81.1 KB Created: 2021-07-29 17:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 70523bca529c154270427c5b1f79e505 SHA-1: 5111f8e181d51359234e084fbedf51602c488fb6 SHA-256: ba5e4eb5f2c3bf871c1e9eea5b77c6483cf640dfd9e7cfdba3af25ba733429f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm hosted on compromised WordPress sites, designed to redirect users to further malicious content. The presence of multiple distinct hosts and the use of formcraft/super-forms plugin uploads suggest a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c590de48516---88735637756.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/k16je28asnmr60u9plr4ufbreg/16499176606.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffffd0b023---fimugolidagimafa.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160762f88d150d---rofilufofubowolasix.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/428820cd32d12f24399a745c6b0e3a62/50140962538.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160944c7695f55---levepufisibijadunojunibo.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/92544177929.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pra0h7913m5d9e9t9bq7cimukd/21429971929.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ffdf421bb2d70d131e0c3400c4614360/rijuluvukojasizawizipariw.pdfIn PDF document text
    • https://agatanorek.com/files/file/58936907421.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/tevolesotupewuribum.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/81850434463.pdfIn PDF document text
    • http://446888.top/userfiles/file/72849697365.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae33414e4f1---22711711247.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd4c88372ce---99108937208.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/97404479253.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/dadar.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/tibaxumomalajotasexafo.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1f1af2582---kuluvejufizidalajatekif.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c2ae7c72925a2363c26160e953abe304/48788853620.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/mebiwubaxifowujuson.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9824ae02a7---zezem.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/778ada7ce1967876328b92dc96da4e88/55281546309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=printable+calendar+2021+monthly+aprilPDF 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_off0000dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 11160 bytes
SHA-256: e375fbaf51b6432283c3c18dcbc46a2351179a3a28fca1de689be5876c98d175
font_02_sfnt_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 16360 bytes
SHA-256: c8f3485ddd757b5f15c20b9eadc311af334a6061fe89b24137d24504c4eca74e

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