Malicious PDF — malware analysis report

Static analysis result for SHA-256 73019fe98fcf1a81…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 09:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2efdfc27a211d80647f6e499d4ed803 SHA-1: ce9e83d3a1d7ba71350c7ac3fde0f88b7b662f85 SHA-256: 73019fe98fcf1a819471e51fedf5b0618a8794f1fc0b2029a385d9db48466552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to domains that are either compromised or appear to be disposable hosting, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a trojan delivery mechanism. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=how+to+put+cds+on+android+phone PDF link annotation
    • http://apothepharma.com/upload/files/fisif.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/64191521348.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/4978896230.pdfIn PDF document text
    • https://brukspec.pl/upload/file/89248587659.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/dazoripizikokizukimu.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/tadukenukofibupepukav.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/dekexofalil.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/kevobevokuxujurudiwazad.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/20944693777.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/63970612438.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134287dbeacc---12942866526.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310bdb8ffae---rolepi.pdfIn PDF document text
    • http://djapm.com/userfiles/file/39550600390.pdfIn PDF document text
    • https://edusfera.pl/upload/file/27548178608.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/766588729.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/82822057966.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210907202938.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/gofemedikekapukekibagubu.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/28936134458.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/1854942766.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/modotudokevukobopof.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132434e56e5c---ziwiguramezuxinijik.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134783daf048---notigoxuzodo.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/74171571124.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/15243514876.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sirafasexivirijeg.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_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 17620 bytes
SHA-256: 18d2976332e33395c61888c6bc4ffb31e1a444fec694bd49caf11eeca12c33a9
font_01_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C5 10740 bytes
SHA-256: e08059ec1de94f18285d0316db4af2e86de719b942fecdad32b76cc3cc4f9f0f

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