Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24f116b1503cac5…

MALICIOUS

PDF

98.0 KB Created: 2021-06-18 20:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1aa6a31296abd64ec2a1fff519ddf983 SHA-1: ff25d0c976f6122c4dc7d16ed4f4b689136e7ddc SHA-256: d24f116b1503cac532370752ffcbbac7627b77521506ece67ff3fb905cde4623
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, many of which host other PDF files. The document body, though heavily obfuscated, appears to be a lure for a movie download, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ee2c30612---levizenudazemux.pdf In PDF document text
    • https://moto-trend.cz/public/files/fck/file/mulumovelosirewuzipumawa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3fbc6f1fae1d7bd6ed67f2d0085a3e65/bunufibisopuwimexesoweke.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/18834634159.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3d9ae180c---96182716054.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16075345b43494---sofebifavudoninopixuvu.pdfIn PDF document text
    • http://alkanboya.com/files/file/%5C/fojegigoj.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91819171d---53972833668.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/d1bc6a76d0c7u9ld07imm09q72/gasekasilofuvitokijaxip.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/632fe26589aa25ae27444c5f705cda05/worulutetivum.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e45c188d17c04fd69259e06c6e3b404d/87092829868.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6e606dc2028657253f6a58a1f822db9f/jenurelebag.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/c4cf5afb01e8abb584d5e0c49e8c4a6b/tigakulepejatulunameramox.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a5d89548---kizodumomogevawawuvafo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5k8mb8310et1o7t81h9cd02hr1/pezebaxagov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=shrek+2+full+movie+putlockerPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 5228 bytes
SHA-256: 037f2051a7c8eb6c3e07f634c4a0f57779e1604c496f60bd93bfe1d9fd2fa593
font_01_sfnt_off000129f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F8 13728 bytes
SHA-256: ac1ac02f71d7063dfc00636005204715112f0aa31c6049d3590dbde7ca0e45ff
font_02_sfnt_off000155e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E0 16296 bytes
SHA-256: 6213bb0fbfe14e05866295ffef54d9e66329889e084efc4fce081ba8ccb47914
font_03_sfnt_off00016b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B96 6068 bytes
SHA-256: 4b45f33c909d1de4119f908b2e4eeec8b51571bcf8b126b8fe9c8b95bec6d9c2

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