Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d4ab3ddce0edba…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 00:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 979fd863f44aecc98fc1660ef5d31224 SHA-1: cd72461d5150aeea91f730a8f37647822a5fdad1 SHA-256: 97d4ab3ddce0edbaca6a1e39665028c8b111433a992d1f2cc93c1122df3f75e1
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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=download+lagu+mp3+gratis PDF link annotation
    • https://hebatkeren88.com/contents/files/2051108984.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/bunalafefutapid.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210907121819.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/filixip.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631958765.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/25192091671.pdfIn PDF document text
    • https://conrays.ru/f/data/3921934028.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/h235jan163l4skhkmae7blh021/21280696571.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/zelevebojonafekezobasolum.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/87915047512.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd2416a199---30403799373.pdfIn PDF document text
    • http://chinalabware.es/d/files/81869720594.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/79267573752.pdfIn PDF document text
    • https://songhongresort.com/img/files/97390868778.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/1182837922.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/fajir.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/68550114906.pdfIn PDF document text
    • http://minerva-collection.net/files/files/95695742380.pdfIn PDF document text
    • http://ihdbd.org/upload/files/17259988878.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d92e3525d712bb111bff3fec824d28b2/19202396473.pdfIn PDF document text
    • https://successalpha.team/upload/files/26689660170.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/68665594860.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/31356680160.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 19420 bytes
SHA-256: b8e11b87490aa34a24cfae00285dd5870889853d02d7fd314f0e035ceb5f0285
font_02_sfnt_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 10964 bytes
SHA-256: 49bcbf5d6f6e00c4df83912fe0371bcb9967d91db33f2031bdd3e31ea9d87fe5
font_03_sfnt_off000135de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DE 16336 bytes
SHA-256: 4aa4ea582699fedbbdadc063f43bd1b4cbedb877506fb1ae283ad7d0e4518604