Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3fbaa30e7ea760…

MALICIOUS

PDF

111.7 KB Created: 2021-07-31 22:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 616114d2168365828ef80869ab1e921f SHA-1: a977416386da8ede12197810a8d9f1d7d7acb254 SHA-256: fd3fbaa30e7ea760801ba55fddd0efc8aed112dad6763dab0b55e30cd36d7fbb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bef879aa6---fegurubexi.pdf. This pattern suggests the document is designed to facilitate phishing or malware distribution by exploiting user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://nomylo.ru/uplcv?utm_term=can+i+use+5w30+instead+of+5w20+in+my+toyota PDF link annotation
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c0ca2cc2bb72a1e19d3224332e39edaf/7281665852.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/48196825554.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/nujarafojiguditepepir.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/jurerigej.pdfIn PDF document text
    • http://teknis.it/userfiles/files/bomelofesudebu.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/jazolovipugexo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bef879aa6---fegurubemobobexi.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/85073964879.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/60557285906.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d27a623abe---pupotazexerowupigedujizi.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/39109236766.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/44512492337.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wumoxifelamuratamijozinug.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/befezuvemoxixawe.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609012a44548a---paxusifo.pdfIn PDF document text
    • http://robbes.nl/media/files/65770230978.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/roboxitilewaluvapezeb.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a178452970cd4f5d89c3f55e3470f4ef/jokelop.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd5b5c5318---66669425177.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0bb4d56d5499df88d58459a1f8c4327a/27600970431.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f857973f---zejum.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ed51e07ff96---70435727057.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/7qfi2561sfrdbrvigsdjkuh68u/lokopujuwijunufiga.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/23253304951.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/69028968595.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_off00014ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000166f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F0 17912 bytes
SHA-256: 3d0ac0377f3c1ba1a3e76894c4e1efcd14284a8d6c04437d6599204f70e1ea8c
font_02_sfnt_off0001962b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1962B 11248 bytes
SHA-256: 883bd2b672d8b0df085251e0c45c9174ce496deda1f3b0de5a5e7b46c4ef7709

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