Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f19e894610ef3b…

MALICIOUS

PDF

86.7 KB Created: 2021-08-20 02:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 359067cf9b9c6fd0d064826df3dbccc8 SHA-1: 4ff26670a362af94b48a35d271e0bdec259c70c0 SHA-256: 16f19e894610ef3bc549ae970cf340fc3282b04e94acdd1013809581c49faf55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains a large number of URLs pointing to compromised websites, many of which are configured to host further PDF files, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://synerhu.ru/uplcv?utm_term=pf+withdrawal+form+19+and+10c+download PDF link annotation
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/v77qj5jigb53nbj4tmvqhv2nh2/talafasesigikakiwexasi.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/29233200081.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/34041577603.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/24016770434.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/2a163a461847af56417ae0a7afa2475c/gelaxuzipunopesumem.pdfIn PDF document text
    • http://bjjiffy.com/upload/89617715175.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/85609184426.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/gizedawemujolataludajaxom.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9fe6479d---1825948703.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/17206920739.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/62717870629.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/51090521568.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/vadeb.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/l2t2vgubnqonktt72qft8f3ds9/tirele.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/00d4133d907e69b8fdc48439566b5e49/jomilosefutorigugevixan.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d17d9e342---12686091411.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/waresuvizawunazemeb.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/fujetemipomikagive.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/72960803177.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/bozadudixoluxibixoxawixul.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/14578397706.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c950db3d7c3---58513092082.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63232786c2---9523330130.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/gudezed.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b129ab8ce---tujoxakinu.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/vafixutaxiwuru.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_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 16896 bytes
SHA-256: 1dee8fdb430a9baf8928093226e34a74aa5772ea9e54db7ef030402bd8f914f1
font_01_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 10868 bytes
SHA-256: c098c962ae0e39e7af222d77ee2732af54c1e8420ffeda61cb9b300b4c49c0f9
font_02_sfnt_off000132a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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