Malicious PDF — malware analysis report

Static analysis result for SHA-256 31de329ff35d3716…

MALICIOUS

PDF

93.4 KB Created: 2021-06-26 11:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5477ba11a8f974003769d254a333e0d2 SHA-1: 5413ffc7d9b37110f7fadaf9e00a2bdcf93f2407 SHA-256: 31de329ff35d37167ad74525b64fefaf78a182d94b737d4f403e5015e74559f1
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URIs pointing to various websites. Several of these links are hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or conduct phishing operations. The presence of multiple distinct hosts and the use of UTM parameters indicate a coordinated effort to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=the+bean+eaters+by+gwendolyn+brooks+analysis PDF link annotation
    • http://kameleonhastanc.hu/files/file/92544895119.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/mazanakajubasoluri.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/vimebifurumisomemofapuz.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0b2f81cb72d656baf280c88fb5de04c0/xeweba.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2261d0c4a5---ponifawunizofebu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/5dli9fvpd5gdqska3hhomkor6s/51668234471.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bd36cdead5fdbd195e1ad329e43bc5d7/42949318974.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/s6d7fr7chmelas0d2o16s2oc3j/88611825666.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788a79b85f2---zupifijebelebi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d00766a5---84415967242.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094d828c7be5---92355640000.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/91605335757.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160974d45cab68---92814664018.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d790924f403baf6a62f49d91101266f0/5170298311.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/rfqc3b4ed1hpd6kl3v5bkdcu27/binirobupizuxat.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff6e1e25fe---40613903400.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/1c2eee95b93c71b26d3de5c58e678fea/44310267789.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9o2gigmu6h7fedn78dkltugcl3/torubojo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc951afee0---63404173488.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/41202872350.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/prcivl3b5dj5qbcbgpu7f75e58/katozuxafesebidajazo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acfd1086ec---83343158349.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/1938624887.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee46add555---dipexaburenoviwekexadoli.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_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 10920 bytes
SHA-256: 205d371ea70f3527bc790a61459fb2bf17a578f191985d72930fa9df91004273
font_01_sfnt_off00012170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12170 17136 bytes
SHA-256: 55db8aaa13aac95e62ff1c5c413be6e0e7650857d69a2ab6ef2707dc2944809b
font_02_sfnt_off00014e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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