Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a5b82d9132864d…

MALICIOUS

PDF

90.7 KB Created: 2021-09-03 04:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 527ffb317e47cbb47b8255a7b02aedd5 SHA-1: 7f5e12bbab95e5e466099d2cb687d80a897adb56 SHA-256: 37a5b82d9132864de9dd7c1b2b2a139cc2583d99b07a1185497a88877edc245a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://canxetaidientu.com/images/file/winawero.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e04ad467f35---rukeselod.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/42103857853.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adb58c15f91---madinopufamufup.pdfIn PDF document text
    • http://normel.org/files/upload/file/86696386984.pdfIn PDF document text
    • http://sushi-belovo.ru/files/besosusunudabapenexuj.pdfIn PDF document text
    • http://polipack.ru/content/file/fasesisizevom.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7436ead83885548002551cc45cf25a13/85764551759.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/67121128775.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/mababigajojo.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/6d0c7594969cc32800e534577067c165/gonusewebo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e12660a5cb3ff87eb79af95c964f10f2/89447859980.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210815191154_72677595.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9286e8a4---zomudigotupaforokivujuwi.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/d659a59db234152c5e35829e22a52fc7/58694335801.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/47298387352.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/13981316666.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/92349011548.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/9229404076.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732946147ea---99128894310.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4a9ca9c93f9ccc01f0b556b46c9d50fd/fawanuxilezudemejag.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/jodigopasufifilodawamuv.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/xisixafamawis.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/15483892370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=english+love+poems+pdf+downloadPDF 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_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 10884 bytes
SHA-256: 15247cab3701ccc0dc189330b5270089acff1261a78dc305006c22b5308442dc
font_01_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 20440 bytes
SHA-256: 3f9bdefc524b13d1a3babac6a0ec12b056f9862b8d2e18a1437000d1c496d1bb
font_02_sfnt_off00014534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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