Malicious PDF — malware analysis report

Static analysis result for SHA-256 778770d3635a20b5…

MALICIOUS

PDF

101.2 KB Created: 2021-07-13 02:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adebd19da3790e567b7b6ac00b9a48b7 SHA-1: c737040e5d611e555c5bb30fcb503354fda0ff43 SHA-256: 778770d3635a20b51a72b821551ae663100dbf87ccb78533353f3e7dd5343460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://muszempilla.com/files/file/joxuropu.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/32552059c79fb1e05465c284a0340f88/50806107359.pdf
    • https://groupunsur1.com/contents//files/80326211047.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/be12672410122871c24c70f43ad8a91f/borexupokutotokedisuwono.pdf
    • https://metricgroup.it/uploads/file/xawelade.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1c071b7a92a99bc769a1f6f613eb6910/xabojufuxuxoduxubinutil.pdf
    • http://scro.ru/pic/file/65922282354.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0bf1e59da---54580315081.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/15bcb0b10a75e4387d3ff0b6452afe90/45069496700.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/n9e4au0ld06tv0n1k9tvgjheeu/57717922091.pdf
    • http://stpatricksreunion.com/clients/84553/File/32897983134.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/92652c7ed10d1220e361eb61b742a310/60485476686.pdf
    • http://velocimapper.com//webfiles/file/12601467036.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/zaguparu.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/26182058944.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e631e7913e---bokozilonojuferurewu.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4351cd3f50---joxuvadogebexujovito.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f7833cb6ce60a8e11120144a261e7e77/dugazodov.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e94c87a95af---datomewaragavewa.pdf
    • http://vnationwide.com/userfiles/files/tufavosiliwopar.pdf
    • http://szpk.hu/_user/file/73657160562.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/nuginekimiwebaba.pdf
    • http://royalwedding.jp/images/blog//file/93333109018.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ijkvqvi08fpf9i4o504np6l3hn/sijuvavigosafozapoluxu.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/97696801453.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/7df0634ad8d3a4848c0b82e8eaaa4304/73784295877.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=active+directory+design+guide
    • 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_off000129a4.bin
eb0f68ec2f0ad44db7959e5cd40dd323d5ac2af08614fa3c0fcf084c948e52fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A4 17680 bytes
font_01_sfnt_off00015762.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15762 16792 bytes
font_02_sfnt_off00016f79.bin
c591cab61a92e94fa0032273c25841ac4a483a10eeb4845e245697cf568fe742
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F79 10600 bytes