Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1604968c989829…

MALICIOUS

PDF

127.5 KB Created: 2021-07-20 06:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 170851d0b59ea18bcc8ae7ce0c237e62 SHA-1: 5e55f3efe9b294b6f0de8f6914146ecc8738fdf5 SHA-256: ec1604968c9898290bde99d59463ec2475788fa7f8137d70f5bb7c9de83bea65
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. The document body is unreadable, but the heuristic findings confirm a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e564dafbb---68967014557.pdf In PDF document text
    • http://ellissi.org/userfiles/files/10771249112.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05e44823b---pelomivov.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160947d86d45a8---1330862348.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3a14f5f2b3c5bc0fd87b8e19beca9803/farenuw.pdfIn PDF document text
    • https://etadelloro.it/images/file/73401832558.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/016310f73fb59dab6d15b62a5ef6021c/66506841352.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/wonaximimekik.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/gipekewilagoxo.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f88466027---5079949246.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a0ed8d623e59cde026375960bcd8dbba/36425015104.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a03255b51f4---33975286304.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/iufm7rr9sjvao5hrp2ui4i392e/48772794615.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1270965cc3a6b70f00a013515347f439/89865608118.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f5029d73adce0365771520eb68134454/56603419039.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/55654165202.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607433e09ab3a---dorefobobogi.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/korekatedilanod.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8h18fo3ingbkknj7psuarkei36/turidogodijapaligola.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/74a7face4a538694bb497f827bd12d38/fuwedevanizozo.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8684d328fb203dac356b1403d5efe5ea/rapozedenudisozovelesof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+father+play+pdfPDF 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_off00019420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ac32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC32 17728 bytes
SHA-256: b3f020ca91624372b08840310f85360365be4aaa9a38fcb991cd1ed6d6a62239
font_02_sfnt_off0001da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA68 10188 bytes
SHA-256: 43995bc39bc390a957d7a7727d5f51f2a5ce4ed379f6fd4dd6fc4c2db9c1638b

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