Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a79a280fc98a00b…

MALICIOUS

PDF

73.4 KB Created: 2021-07-03 17:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 395ad996a0fa8080e1276563a1cc0f60 SHA-1: bc56e3910df365bcf573b42d213dc89694103d6b SHA-256: 4a79a280fc98a00bd2b9929f7476fb3614b72550cbccbec577008a1aa33bf1ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to distribute further malware. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely designed to trick users into downloading or interacting with malicious links, consistent with phishing or scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/co21gsr3vq60gm1ttaeu76kjk2/59776726017.pdf
    • http://edgecs.net/documents/zutidedarimofibagifafe.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb03674a39---34429712601.pdf
    • http://katyababash.com/images/uploads/file/98877220026.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/jurekio8pma81bcmk0du82cvap/30685609378.pdf
    • http://mofrantech.com/userfiles/file/29567080494.pdf
    • http://aroma-es.site/yamituki-n/uploads/files/masaxapovogikinapewilas.pdf
    • http://unseenadventure.com/userfiles/file/bojewowaradoxog.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab363c73b3---mijaxuxokerunab.pdf
    • https://people11people.gr/uploads/File/budoridem.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081401bc42d5---xerimu.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119d7d7154---64211190118.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3750a5df1---77814082890.pdf
    • http://www.aadhar-interior.com/userfiles/file/piresoga.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/dda8eiah40u04blahpfb25t26b/zuzugofenigolaz.pdf
    • https://liniagdanskzydowo.pl/files/sowewavakeg.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/29f3351840fbfeb7d6545531f88656ff/63080558170.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/bbpijfika8m1f8tff5gak6hvrm/muselugagoxativisatof.pdf
    • https://vannordenvastgoed.nl/userfiles/file/79214688547.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/aba26160f2c178e77854970aeb052e12/nevebino.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/24701705329.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=courage+the+cowardly+dog+pharaoh+phobia+game+online
    • 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_off0000bcdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDD 16792 bytes
font_01_sfnt_off0000d4ef.bin
3702a58a6ac4a8bad5e4a161f9aaff868b254dc1cc71b390ebb42ff0a6f5b581
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 15964 bytes
font_02_sfnt_off0000fe39.bin
4728bc6a1d4936a140e3a289057e58869ac1053133d4e934d187926f8e24e2ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 11264 bytes