Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa0f8e7f477d49f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 05:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f38883d44415e0b3c20a300befe200b SHA-1: 950542ec85edb11caadc8d64c8af8a8d89612758 SHA-256: 1aa0f8e7f477d49fddcfd29b160578384dcd74cd0528c7d418796501318aa2f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jajugroup.com/ckfinder/userfiles/files/votiziwuvejij.pdf In PDF document text
    • http://yucehukuk.com/resimler/files/nusigezewusekivibirota.pdfIn PDF document text
    • http://autovoda.ru/upload/files/43166378121.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/61286532696.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5ac4e8940---23302115505.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/82406e277544bdfb7d2b9bde887a938a/59136863726.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/77546227228.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/50509299985.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/fogefa.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/vofinifujitar.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/gosaz.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/96718185571.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/16082799815.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/nititi.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/suniju.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/90130922230.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/vuluvuzafuwozibeme.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/2906453152.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/61895209990.pdfIn PDF document text
    • https://camphacement.vn/upload/files/tewedaz.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/59929094406.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/65212541719.pdfIn PDF document text
    • http://4bx.pl/public/file/susineris.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/sasizujepilolapajafaful.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b276032100---tesel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+way+i+hate+you+dramaPDF link annotation
    • 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_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 17508 bytes
SHA-256: 3d5e044110b21fff3378a20d3446db2be66e096d423859eb3055e24353dd25c2
font_02_sfnt_off00011a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6D 10456 bytes
SHA-256: 7b9e30cc05cb2e80d453b2b6161a974181f864b940e20bd5bc68f0f686e819b0