Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e57971d4d84059a…

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 15:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3937649f2b9a1a66578422ccb4135a5c SHA-1: 62a8261cddc39876aea0a3b9b270708f84109b9f SHA-256: 5e57971d4d84059a154e24cf955eebd6ad092a7e3957b4f7aa49f00420155ef3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://isotech.si/uporabnik/file/maruxezobevegole.pdf In PDF document text
    • http://nyett.hk/uploads/news/files/64170325545.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///xibopizixadulitukerorapi.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/zovogajidasimajadojet.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/maposuge.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/59076742875.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/zemateba.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/dc137ab8eee2b7e6b9ce1fcffb38e098/83306969701.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/86179213855.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/sixegepagora.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/juwinipusaxuzurobuk.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/tesojafepovive.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/15747326011.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/ludosaxarikixuzarav.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161338a12ca7b1---18780227512.pdfIn PDF document text
    • https://securitydm.com/slicice/file/mejonobasusudujafimudu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88875867d---89430653186.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161381815a50f0---dujemap.pdfIn PDF document text
    • http://csp.hu/editor_up/88351178770.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/91276206505.pdfIn PDF document text
    • https://kvzriu.org/images/file/kusumukobosa.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905211349_lpone9.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=contrast+linkers+exercises+pdfPDF 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_off0000bff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 10840 bytes
SHA-256: ff49c84abf95245aafe60182e05f818ee2bfe2ede8d98ff237abfeaca729efe1
font_02_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 18700 bytes
SHA-256: 89cf28f87db0c37e20ece944b4f2c8736b54fa4ae1f0516dcd8d94f68449e7d1