Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f0eb27b9b9480e…

MALICIOUS

PDF

87.7 KB Created: 2021-07-06 18:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c72d091b8f62b1e202a48d7d441f376 SHA-1: 326ee3381b272d9d2aee7f01eee8bfdd64b0f35c SHA-256: 51f0eb27b9b9480efa77030c2a0a4e028916c0905f1fa8566c0e4e51cc87b2d1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly support its malicious nature. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j84ml4t6efn7uknq5fbt7h88v2/20518798801.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e336e4546c---xusuvikevironexikexozifa.pdf
    • https://universal4shipping.net/userfiles/file/13486488525.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079432b5316e---bavidaliluwoli.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7hniorb2976235loam5qit439p/84383031635.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/g83c4ff2e7ik8gdeeh7fc2amns/keluligavajunolun.pdf
    • http://giasuminhtam.com/Images_upload/files/44108642876.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160741899cffc2---55610302691.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/040c63965d46d47fd5a29e0160b840b3/kovajajetimoroxiz.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/2v52nb5mp3ddug7rsqd3vq7v35/58450649907.pdf
    • http://slstudio.it/userfiles/files/fapurefanepegijak.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0c0bf9ac---90156451186.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160df7ddda1556---60347443412.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f10e90860---fejeriwodebanug.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d1393786---gomigiselupofesamib.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c23416a01ad---zibapowuzeva.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cfeb2ea4e---51914160214.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e83e0408---21446845380.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092899217eac---tumow.pdf
    • http://blbr365.com/userfiles/file/1621244602.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b55a3b385f1---sexogiwitususabupun.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/mdi699m01etdsvpatt3firlq5v/lopoxojovaxoriravoxuwujo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+a+meteor+to+spawn+in+terraria
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef66.bin
6bfd2e8e9ca793de43caa11bab07fb56100026c7127d3fca2c8e7d9008341b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 18724 bytes
font_01_sfnt_off0001212e.bin
430b1fea332069f91652200e7daceb0abb7db2755c4020ab47d89fd0be33e62f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 10624 bytes
font_02_sfnt_off00013981.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13981 16792 bytes

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