Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad7745f21363e19…

MALICIOUS

PDF

79.9 KB Created: 2021-07-25 09:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bdc8d73771d15490f1b9abdcf9c0103 SHA-1: 3f805e35b80ab4f88e4320e50a1793669408e690 SHA-256: bad7745f21363e1927556e5db8eb8cef92e92497ab756d24a6f317c483887e01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute further malicious content. While no scripts were directly extracted, the presence of numerous external links on potentially compromised domains indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/62603899444.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896ed038b50---bajogufaxa.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607508931838e---mimozugader.pdf
    • https://milliondollardesiclub.com/upload_files/featured/files/28594617825.pdf
    • https://powermailer.in/userfiles/file/39874227360.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887483dbb19---56044231629.pdf
    • http://barcelonasixtytwo.com/userfiles/file/kenojirotoluwamuk.pdf
    • https://masini-de-ambalat.ro/images/userfiles/nedozatukenajul.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c65c9da59e---95021082908.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fecebb4da7---zejabaguvazuxuparidu.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7a5338206a6d33a5662d4c700857f80f/5493419229.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210605_56F89725FE218E7B.pdf
    • http://sola-brothers.com/userfiles/file/vojamozux.pdf
    • http://industrialsupplies.pk/userfiles/files/69072931935.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a819330a80d---xenegisaga.pdf
    • http://dashoernerboot.de/userfiles/52377519225.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ddff2b064---26831915295.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/69140e66e811c7cf075f49effd36c107/1423980635.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oqf4adsfegje0bquq5cjselfs0/saruxosixojazojafusilivuj.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/28c2e04632e76cf67bc9947240ee1411/52235310587.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e9a376f79---mowavavafegobotonixaber.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce06153d61c---pajozuwopikamono.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+download+lagu+astaghfirullah+opick+mp3
    • 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_off0000cd96.bin
8756daa34f800601381619b1c610d884a5b6d6b7d0e734fbb5ff77947b24fa07
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD96 11492 bytes
font_01_sfnt_off0000e877.bin
d005fb33a84461b7fd5a6dbb7b18dff89aaa7e5dc95c6111b4c4e421d6f88089
pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 18264 bytes
font_02_sfnt_off0001196c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 16792 bytes