Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4cee3d5719d068…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 12:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df0e77215dcdf6b51d977f3f5ab880aa SHA-1: d50816a33bbd8779f6dbe1d390080dc731fa756e SHA-256: fb4cee3d5719d068a4115cb84dac3bca65b9003df5695518362d0b9daf07edb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites or download locations. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=good+lock+download+apk PDF link annotation
    • http://telektrans.hu/editor_up/pefunerapelimurulas.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/16196753212.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/vumoru.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/72912424177.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/panemux.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/40325077110.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/44855424224.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5617c37bb---loletuviwepavomijoteker.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/gatabuf.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/zupagoluxofoxaw.pdfIn PDF document text
    • https://esvigo.com/upload/files/jagijoderamizunoxa.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/roxijigobiwanipojuxitini.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/sudadajetofikozi.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/91429724434.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/1b4feaec0a857bbf785059a0e379e717/nekeradezowamirav.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/nurite.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/tifuwoninif.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/pusinuvo.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/xizujolukulikomi.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/lolenegowigivufiwobiza.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba71b02ef---buvonaradarod.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/94905603152.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/rowiguvitofigaxito.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333bdddf6b1---puwinowuraxenajod.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090404215751.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_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 18492 bytes
SHA-256: b4558d2d91b419d126453afd6b5ab0a234c8be7c28a62240ccc70ae8c5ba5e9a
font_01_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F0 10136 bytes
SHA-256: e451f79c4cd5948b4748dffcfd840910951cccce93898b824e1c9faacd58d521