Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5a24b598f8ee14…

MALICIOUS

PDF

79.5 KB Created: 2021-07-26 04:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebec4fda2eca19cbc87fe77f38116285 SHA-1: 752ce380e1f5b4d22baacadfeb7c3cafa2935d57 SHA-256: 1a5a24b598f8ee1427dfd5536d8a0e2ebd5eeb7fb18cf8a25e6dfbbfd562e628
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/nob24ab33h0e0m8t88e39pft2r/23967810464.pdf In PDF document text
    • http://gardenofsound.com/userfiles/files/dagebukajatepumapirurike.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/86828287588.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c2d4a05a93bd1f6ea97e69e91ddd3144/48787160124.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/mediwejizifowukelelono.pdfIn PDF document text
    • http://foodchemsino.com/d/files/53537567980.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215552652053.pdfIn PDF document text
    • https://andrejc.si/files/file/50814897579.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf60c35fa---35135216960.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/sukawetuwenuxewuram.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/58051324650.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b79b4dca060b9dcb3e320fee26d9a35a/14457486747.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6145bc84c---nonoboxesolozow.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/u3m0ab2isujgrvr472mkj3lrmp/pururigenalulaguxovoludof.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/diteg.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/mitigowizamujotarofowavan.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/zaxudukin.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/a9d9d44f6613742541272efec54032bc/5924009343.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/73196087079.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/82604905263.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xeniror.pdfIn PDF document text
    • https://bdcomunicazione.it/file/bukexeluxorajog.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/4727335161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=why+are+my+keyboard+letters+not+workingPDF 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_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 17360 bytes
SHA-256: 4cc6bc6bc1cc507b5efe3e2776ab9331909dbf62a3ed0442cbca62c7b24d50f2
font_01_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 11120 bytes
SHA-256: f25154416cfd2335e3b2bb2b915ada3c4042e6857f9fbbb5a5b741ff31292de4
font_02_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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