Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d11b203675411f8…

MALICIOUS

PDF

189.4 KB Created: 2021-08-22 03:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 443ea06a090c426d23bc138eb618bb4b SHA-1: d40121408076a712ed88a8a1443c3e3256da16f5 SHA-256: 5d11b203675411f83cccbf9c9f2433d740667bcaa9bbc6fc21f7df7409554ed1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_MFA_LURE' strongly suggests the document is designed for credential phishing, specifically targeting multi-factor authentication or one-time codes. Numerous URLs extracted from the document, many hosted on compromised WordPress sites, likely serve as landing pages for this phishing attempt or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://medvor.ru/uplcv?utm_term=top+juegos+android+2021 PDF link annotation
    • https://palezieux.com/ckfinder/userfiles/files/mapedajelenudozo.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/wotolenujez.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210617210119979390.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/57f1f04b264b8d9608edb73d56b8c8a2/91508621300.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/abcf364989a862c64578231d54da0f6f/41697587555.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1a009f421b6694c37f01df155f30c781/93355985972.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcf6012b50---67911637956.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2014cd8a176483f3abd3be27e0e226e6/66313167676.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/jipivazawutaduxuzin.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce22846a09---favepen.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/folonazaneparakizow.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k6qe1glj22qu6adusb73se9bhi/wobotamapejuguxof.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/dejibopikajirabukuwinu.pdfIn PDF document text
    • http://bscartridge.com/pic/vipifibadibe.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16083bdc1949fc---7194267189.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c3707deaac791953a75ba02460ae6229/95357634481.pdfIn PDF document text
    • http://vswet.ru/f/puwedaje.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3fdad4541---wofoluxez.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d109b9c1---38666042124.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/56113164556.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/b0qfm0hjmf6vgggtgslndkrpic/46263505727.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/44053253885.pdfIn PDF document text
    • https://heyratacademy.ir/file/84846316262.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_off000287e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x287E5 17968 bytes
SHA-256: c9c21a49d679991ff5f3b01f7965fe7ee8df15346badb66d0ceb5f8a90b9718a
font_01_sfnt_off0002b68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B68F 10912 bytes
SHA-256: c1ec2215d04490b96899956b3e896f956ddb51fc4bcccaba0335f485bcbeec26
font_02_sfnt_off0002cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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