Malicious PDF — malware analysis report

Static analysis result for SHA-256 1691b4dd82462233…

MALICIOUS

PDF

72.2 KB Created: 2021-08-05 00:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4477c552cd5e5337c2a5e72709f1783 SHA-1: ca5ea88e5d84b62dd7aa5b3e2e9427018e3b4b3a SHA-256: 1691b4dd824622333b14769931bce1a46b103c238e580bb4904a5d430cb19784
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. This suggests the file is designed as a link farm to redirect users to malicious sites, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://coretry.ru/uplcv?utm_term=how+to+enter+cheats+in+asphalt+nitro PDF link annotation
    • http://sns.hu/_user/file/rubunu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f0366b38a---35005830394.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/1718612705.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/cf96fa92e58109dd8664e68ca3339072/newupifozumesatoje.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/b6ac512d05c75ecf864f0f7726ae803b/dosuwebutuzo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f49933ab7---piluwarodit.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/65717734341.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/zujoxanujogodawujujamonu.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/529501e8c20187ce0b2665b3a7b456a8/dabikenel.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc89c18789---66316721678.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2e5c01588f96466b0d0189d60e33c73b/jozusinotinuxax.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/toxemafugamedonurapab.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160701fe4b4a53---xotupimivaletanimovir.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160add320228e9---nedasepomatojezizezarun.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050206364457.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ff64770b---weniruxi.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/wogikuxamufi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e141644dea0---44918127806.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26cbb5caeb---duzixixipixutefeda.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/213oociqmairjvksdi159abl01/73936797553.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/27414318118.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/5e57d570f0424085e89be6aa52ca9847/bodor.pdfIn PDF document text
    • https://marosme.ro/hirek/file/vozipezonal.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/xujamasakege.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_off0000b861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 16024 bytes
SHA-256: b537023482a9e69fa3f7c1cb0f932609c0bff77eaa671a3e1030cc4ba59841c0
font_02_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 10548 bytes
SHA-256: c0ec408ea9db8a8e2122ef2e8eed8c7faa5733be7700c79789cd43c6e24853a8

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