Malicious PDF — malware analysis report

Static analysis result for SHA-256 743c1a0245242560…

MALICIOUS

PDF

88.7 KB Created: 2021-07-02 04:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 24e7125793462f2dfa6fa0c647651db0 SHA-1: 9d21ea93195479a77601f6fc8d109b425ff706ca SHA-256: 743c1a024524256094dc8cdd88738915c27857cdfa178acdc162bc8a767bbe73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm, with many external URIs pointing to potentially compromised or disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=ucsd+lab+safety+exam+answers PDF link annotation
    • http://assushop.com/userfiles/assushop.com/file/numixedamew.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8db80cc5f---liguzix.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/pikekitarobozomoliju.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/lepetegekixoposojuvux.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/10220278630.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa838d46fe---fomafulibefilisatopakiwaw.pdfIn PDF document text
    • http://allasclub.com/campannas/file/vifenavazodajemigaxafo.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a3306a6872dfce0992b61778bbf15391/gepufudazenebilad.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/mogerifevitesurerinidorar.pdfIn PDF document text
    • http://fructusartis.com/i/File/48792705321.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/34f086ad5ao07mnlvl82cr9247/keduzadetiwewim.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/001b70739b2ed1bb2a3201db3d3a39e5/kajupokadazinek.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e8e7933f---86482745540.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98c13cbf4---bivudolomujir.pdfIn PDF document text
    • http://fedoro.ru/upload/file/rosekavilazusadizojos.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/zakotuwogemupubepodu.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/97639561799.pdfIn PDF document text
    • https://fishboat.hr/files/49696747760.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d279954efa---50755153910.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/51179891015.pdfIn PDF document text
    • https://parfumzone.ro/files/file/pibidadogefoguzofovazefa.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608785f95255c---61216326664.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78adad88bc---feremewo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 10876 bytes
SHA-256: 8b0e8d42625e15642930cdc2bd5d5c691f83596de25b4c8c648935f433b35e6b
font_01_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 17628 bytes
SHA-256: cc41bc82de486d17661efdf460bdbe3972b1416981ccabe4cf5c5cb2d4e7e183

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