Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a669ecc1ffa02c…

MALICIOUS

PDF

82.9 KB Created: 2021-08-31 20:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61273fc6f8c0f0a58051ae8b5a51ab0a SHA-1: 71522a07d926a4344dbc5855e0de259bcbe78c8e SHA-256: 83a669ecc1ffa02c6857be533f8ff43931b4bec109cf80ddd4b95b6e0c6f66bf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=how+to+write+domain+and+range+in+interval+notation+from+a+graph PDF link annotation
    • http://wittlich-luexem.de/userfiles/file/1717805330.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083330b4f96b---miwolajubekelafubizaz.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/v804js5v2jlvsd7dich8kjpl6p/gedefopawoxeguwotu.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/bugotonaxirajolexakesos.pdfIn PDF document text
    • http://beauty214.com/uploads//files/202108120120375090.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/21548020906.pdfIn PDF document text
    • http://gekon.net/userfiles/file/muporejukidolofax.pdfIn PDF document text
    • http://peeweeslearningcenter.org/clients/5/54/545fcf94abc6bccf175f3035c740e6d3/File/83733833565.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/14433842310.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/tawiwemorawuwavivutegeni.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/9874264641.pdfIn PDF document text
    • http://ahchala.com/img/file/fiwujofiwobixibugitase.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c277f0d25---20938031396.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a1d16c17d0---mijavimux.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07b6f7a742---49175055253.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bunml1hajkeej7uhe6r4a37o3k/xatigovavizurepinafawu.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/14412623463.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/100281455.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/zuxukafevave.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b164d3da6---favukitadenazuranod.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/zuxim.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/wujikavabe.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aafca28af8a---sumeta.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ae146f25e04012056a093dba507b0262/12120244807.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_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 10920 bytes
SHA-256: 21f01fb935f5bf9f6dbc968f02c4fc6f935699125c253267dca7415cb0b50310
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 18716 bytes
SHA-256: e3827757c5902cc9fc9717e9038c32f576d2a90d1cfbfef69af5074525a085db

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