Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd27cdcd6443c1da…

MALICIOUS

PDF

96.5 KB Created: 2021-07-08 05:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d149187a776a2e36d96fe126f95cfce2 SHA-1: c9352f44940305f76016ec25b7f674766a1c50a4 SHA-256: cd27cdcd6443c1da834a26beb4734728fd4d8df8e518336a5e52793d9501f4f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 7

  • 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.
  • 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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/56c69a821508aa07bc07f78b24b8341b/80287298469.pdf
    • http://thinhhoanggia.vn/Images_upload/files/90461556176.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608414d2c1987---52139652115.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lk81n7svab54bukrh5ontjqe91/8060939069.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/s7pcn9p4tjn4m8drbeedjmo561/zewebifajol.pdf
    • https://airbays.com/userfiles/file/supusuvoko.pdf
    • http://burfel.ru/upfiles/files/tejukanuk.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/cbe7bd992671d980f360ceb032ecde69/77395056561.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/36b0798e8ac825a166f77c3aea9e6079/91758283997.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073aaa1301cf---80723645697.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afa7e2c804d---79958567082.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/45f3028a52d1572c23448839b6090b2d/86705614145.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/00e434ddf1c71ad7a2ce1afb013a0a4f/tufiji.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/eu1et5l3blovkj28nclhvpqrt6/47277299481.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c916fe69b234364c7f91480ba867c522/29415609976.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1109023ec---bagagobanenigegofuzoj.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/bb9b425196fb307c7bdbe2131a50136c/40468792072.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834d88bc7b8---22526523408.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/sarakavaxog.pdf
    • https://actorconseil.com/files/file/bulepure.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160840ad32d6e5---jaxifeleki.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa654af1b72---39557484750.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160815612b743f---jefewedaforavak.pdf
    • http://nuestratierrapremios.com/campannas/file/baxigojitetogufanu.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/348519c0737c5f7ecbc6375988b3b5df/vakugu.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/45518902942.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=anime+how+not+to+summon+a+demon+lord
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFECA 16792 bytes
font_01_sfnt_off000116d7.bin
c32db8b8d13c8d56e2b8a109a4ed13360801d677b582ec270a96093fbdb3f0cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 6240 bytes
font_02_sfnt_off00012cc2.bin
8b70d6dc42d8dffc0b1d1df50f5ed5e37c9b5b1644781c80408eddf08f62274e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC2 17460 bytes
font_03_sfnt_off00015a0b.bin
9481a5e390d967aedbb57717cc02c7869d2365982be6c4c4b07db1f9dbe17daa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0B 10680 bytes

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