Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a58157619ba5039…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 20:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37e576fdbe82de9694f21863bdfb916a SHA-1: ca278ebf0d1878538c56611337ec555a5403b57f SHA-256: 4a58157619ba5039cbeb25cda0e207390af6dadf9093ef9260303b724dab4923
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs suggest an attempt to redirect the user to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://thekolkatapackersmovers.com/ckfinder/userfiles/files/99529192393.pdf
    • http://esistore.be/userfiles/file/30792548395.pdf
    • http://ecandrychow.pl/Image/files/ximaroxejo.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1723656e2---78029359353.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/mmgcn514d9edo3qgum0lt8e06a/vofapajinazeripunovunogen.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/b36c59a56392ee34a05bb2f18b3954c5/wonanudorovetep.pdf
    • http://sosnovgeo.ru/userfiles/file/ruwunited.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f3446c6b145---nukegezararen.pdf
    • http://hakanhurdacilik.com/userfiles/file/gutawizi.pdf
    • http://cokhisah.com/webroot/img/files/15685143362.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/890ebeed1328a1b223c79da037fe8e16/1406890237.pdf
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/62692326643.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609a55bb10b1b---15777453803.pdf
    • http://alemotta.com/resources/original/file/faralitarisozijufekup.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c7e968019---44537963728.pdf
    • https://monyetjoget.com/contents//files/fifikopatopaxaro.pdf
    • https://www.borzabadi.com/ckfinder/userfiles/files/21714320682.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9dbc8a53093e5ec1d152a3683bcb6fad/16904397891.pdf
    • http://pokeocncafe.com/uploads/files/fifoperukob.pdf
    • http://backkwang.com/userData/board/file/zogomejebutupilonilajo.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f181dd2ee2---38191751834.pdf
    • https://btegypt.com/file/67510179385.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/medajurofuxulasa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=2007+suzuki+bandit+1250+manual
    • 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_off0000d108.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 16792 bytes
font_01_sfnt_off0000e91a.bin
7afb7fa984c5b990665aa3f978220fad27ba2e7da4e8cb010f28fc13a0ab647a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 17276 bytes
font_02_sfnt_off0001161a.bin
8a63a807e600a7622c6a94519956177dcf1fb8db374243e56cb4a3ba13696ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 10828 bytes