Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb094a98917c41b6…

MALICIOUS

PDF

83.1 KB Created: 2021-08-30 15:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da47e20e92d1575278614d0238a19394 SHA-1: 2f99a27cd70ecffbdf4e13bc255b89e3439ecbf0 SHA-256: cb094a98917c41b6a30d5d4a099c6df9ba34ad1aeb72373ec8383d6921b98349
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites, potentially for credential harvesting or further malware delivery.

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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/69e2831939f6ae833ca99aa3250cf183/moviniripujixodejililebu.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160719492751f2---xoxixatugerobuxuromoxo.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/74aee915dd3f47753b4ec3de7489974c/deropipadagodezaw.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0454565f5206c3a53432c6a62125a5a3/wupej.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/giwepubinuzirororupufezob.pdf
    • https://mauspro.net/upload/files/85717905219.pdf
    • http://sumterhigh89.com/clients/863574/File/74100039438.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c5b4c1026d2f0576575865a2658aa63a/81875526064.pdf
    • http://clinical-pain.com/pds/userfiles/files/jotiterowupilamir.pdf
    • http://hilltop1976.com/clients/24685/File/dupevezubekin.pdf
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/l1bf8es2vdgadlgntsgcf09oa7/geluka.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2muso7fma1h5giq10cloe9jrq3/mozidawagojigaja.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8tp6e3lc0r365c3v9etji3efh1/28110444565.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5ab2bd25b---43896018345.pdf
    • http://ggmtc.net/userfiles/files/58540968266.pdf
    • http://ahkjt.com/upfile/file/mepus.pdf
    • http://np-laser.com/upload_fck/file/2021-7-12/20210712211704637252.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde9cc90a4---lotujonoxikepapazizuno.pdf
    • https://ahreco.com/uploads/news_file/20911000066.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af689c2c0---72066723510.pdf
    • https://bodymart.in/ckfinder/userfiles/files/lozunamemabamem.pdf
    • https://kar360.com/resimler/files/sufafaladotizejujuzin.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa1da3830f---janigenafe.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/813c119501ddd0d69f931dc4911c01b2/46229411657.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5q8hkbvh0i4qe6evcgkqkkiph0/47133050833.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hate+life+quotes+in+english
    • 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_off0000dea7.bin
2bacba9b8955da72de8547c5f8706813fbf7f5abe0525ead1b1b9c71be82ddfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 18636 bytes
font_01_sfnt_off00010f02.bin
d54411b92f67d375f97e06693b0bd35163dd167a2c17891ce0b9fe63655a9c44
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 10632 bytes
font_02_sfnt_off000126ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126EC 16792 bytes