Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1899563eefbf1c9…

MALICIOUS

PDF

96.2 KB Created: 2021-08-13 08:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6473507211bc21d063d59527b243bab SHA-1: 6436a27ff029f024d41b19372b18368638011101 SHA-256: c1899563eefbf1c9fca83b67b7baca33a0fbedfe4e0e4a5da24e7e07567a6eea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9446

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 https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f11d7783---vasusupipobujakolagude.pdf In PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210702144922.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/40670550340.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/bb450dbc632e066cab71c99083136f8a/sesopinugimemivudizanak.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/pelowiwi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9a1891e853d50ddf34c104b9256f736d/zudarogiz.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c272cb33195---6089307207.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/losekijog.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a8ea5997a0451e05c63b8d19cd97e539/zulafofowakepewo.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/95503145374.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d850c9dd2c---befarafapetag.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/vetebazeruxojod.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/20695258188.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/zunim.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/933773347700c6984690560866929027/48576406492.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/39c46e3f70ad75945d0d3fad76eff639/faxag.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210725032234_omlc5n.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/74903036715.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af54e3e1d9---fiwabavunobadumeral.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/zumogenasinifukotoj.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49722576611.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20353728b2---waniweka.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/27403325777.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/silonevibulodeduwutejuzi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098443251bc5---wakesotez.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f4e5bf59---5871311165.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/tapobo.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210810024521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=baixar+gta+san+andreas+modificado+brasil+pc+fracoPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 11260 bytes
SHA-256: c08097f060f91db7348ad7fa16030b67b3a4407e29a2541a8c30881e03bbd4bd
font_01_sfnt_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 1736 bytes
SHA-256: 917c43d6162fe4415041be1e0d076aede95f0c20961f65668df81e9e9fd08a75
font_02_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 16620 bytes
SHA-256: 69b3abcc57664b413f39ddcf22c7761ebcc8b5570651700a7a0402bfd41fb223
font_04_sfnt_off00013e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E04 20060 bytes
SHA-256: 33df12a42ff8580cf8d60580fc4a92357f3cba30bd7e0afe33604346f20b8be6

Open this report in the interactive analyzer, or submit your own file for analysis.