Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c4cc2a56774bd1…

MALICIOUS

PDF

85.0 KB Created: 2021-07-07 21:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd9372cfc95c9fbfca0441c1218a65cc SHA-1: 5572f0a607a0d161bc2e2f27e4d617932054a9e7 SHA-256: e3c4cc2a56774bd1a0387f0154f5bb68a0223952b5cfd15f62660b66967e8524
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content or phish for credentials. No scripts were extracted, but the structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b423b6151f8---39470707785.pdf
    • http://csc025.com/userfiles/file/20210619173656_g3kxmc.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/96d33r2e65p3t3einlh78nqm94/64936594005.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0095a18457---99404545178.pdf
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/losopuxab.pdf
    • https://betenenergy.com/sites/default/files/file/lexedomanepewinopopowude.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/nmos0trph77bos1hrgvt4be3lv/59371719801.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9303f3bcb---kuwiwewukoxuvorexezojim.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/6059rn7970ki5q2nifu63pe26o/19690634389.pdf
    • http://avtokit116.ru/!upload/files/samomonafinuxakubojagomuv.pdf
    • http://bartuceviri.com/userfiles/file/97193376974.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160e33f8328b49---88467169841.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5gnrgo1qhkhcpi3shrfm3uo464/vitajazuwunotoxovezofodi.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8bfd953d93d0c2a9c91e0b82e856df1/494164567.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a7508f20504066168c10ca30ffea2661/72175293461.pdf
    • https://all-stage-meditation.tw/uploads/files/60d2a0be41e44.pdf
    • https://seltec.io/images/uploads/files/62586265915.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/9a1bafd25d48c17c51b9e1c818fb683b/33467608845.pdf
    • http://singer-island-condos.com/userfiles/files/73064167490.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf27efa34b2---kobujane.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/61a8a98ef68d8c3619ee1eede9dd415f/bevitod.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/zonaxapez.pdf
    • http://eds-muhendislik.net/ckfinder/userfiles/files/lusizemumabadisokavid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=celebrate+recovery+step+4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f3.bin
6bbe594bbca97669aa4ad814ebbc6960b2d88255819d64825989b2c90e592b7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 17652 bytes
font_01_sfnt_off0001168a.bin
22815877599558bcfd2d0b384f4f893e29c46ce0e7534592aa9d8429979533ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 10600 bytes
font_02_sfnt_off00012eda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 16792 bytes