Malicious PDF — malware analysis report

Static analysis result for SHA-256 11faf30a6f2cbb06…

MALICIOUS

PDF

83.0 KB Created: 2021-07-04 04:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dad2e0a633c8992c6ef172cebe1266e7 SHA-1: 24c33fcc120183ff27a9b683fed12e829778e0cb SHA-256: 11faf30a6f2cbb06e70a4a93cd424090b24c1f3203bd9b7c8468d6bee188be71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/buvapaxazotisijilujaxizo.pdf In PDF document text
    • http://bularz-auto.pl/images/userfiles/file/kusijozubotetu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cb63b387f64---14897819116.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/73982367368.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607952a46029c---82206154724.pdfIn PDF document text
    • https://noddy.nu/images/file/65990702636.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/parezekobepotoweluv.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/2812302370.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c61af6be1f1c459ae05d2b216be38bc5/47663305816.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbbf9d3fa0---54310035280.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607624e195781---45914299132.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/nujumelipesiwafedega.pdfIn PDF document text
    • http://saptpadi.com/files/file/20620546716.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/nikeruzazusulador.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7vid9ibpdc2cg6j1nkdd45hg7p/liwipefelibimurinazuxanu.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/20818444974.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/35845397523.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/4nm9cu1osg8cl0su00umtajq01/tijipinid.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74aeea086---deludinasedikowadezozo.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0a6c11b7f2b62101966ee06b1c429d86/weseko.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6k9h7tjmnkcehnipfrmv7fe8g3/fixageda.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1d2c594f4a1fe1b509e51392cdfdf216/98501808171.pdfIn PDF document text
    • http://simonide.org/userfiles/file/lifikuxefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=water+cycle+sketch+imagesPDF link annotation
    • http://irodori.kir.jp/files/file/dofogejapib.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_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 10652 bytes
SHA-256: d550d9a54c5c3fbb8ffc0f915454295afe1b805fe4fb1ea2fe33d95af634e362
font_01_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 16280 bytes
SHA-256: 43ccec7d54db7072345ac88d954d2637f2050ae14e66d7d753e42ef04eb8167c
font_02_sfnt_off0001267d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1