Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4430b9d5a84bb6c…

MALICIOUS

PDF

90.0 KB Created: 2021-07-01 00:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 281ac991aabb23e39b11361076bcfb9c SHA-1: 88557a344571b5f11ee67baba926b353efd3d73c SHA-256: e4430b9d5a84bb6c1c201abfc584479e0c4786c7970cb68a7ba01290eac0ae78
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised or disposable hosting sites, likely to distribute further malicious content. The presence of invoice-related language further supports a phishing or scamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd99e321a---lusunoj.pdf
    • https://marwaautorepair.com/nbloom/fckuploads/file/nikakurizoxiresona.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1ed20qhj938j4u9k6q5q2hfk5e/turironewala.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/082946b97d0b25c1dbc0b925b62aa39e/76219953323.pdf
    • http://a-kamen.com/userfiles/file/92933765835.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4548f0e4aea97784c0104b3c29b7d859/zanutanu.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12fe3d4bb---50830969861.pdf
    • https://maclashoes.it/file/vufojux.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/q9gjt7puc52n88qtn5sqkphsh1/43991384953.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608114da5e1e8---59210619810.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4811950391---813856092.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce56e226f4---nixozukedujatejumojevu.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/pezelaledu.pdf
    • http://acecaalcoy.com/userfiles/file/risarosekapaba.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/7s3lslktd8l918jhllevrrceb6/87647726076.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q6ai2jo4tcb4j5t5v44n63j7f7/matusubavaparelabexaven.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7695636d---tixinofatuv.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/nu08uhmjd3g0ve0mlbbr6k4u80/35790161632.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/7favi1dfuaorvjqq5ks2kfe21c/21218318818.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c2ebbf7e1eba05cc75cbecc6ccc5b64/nepezutepiwozifiga.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6f64fb60ee28fea49cca0ab44d05d356/bazupeguwizedelaxase.pdf
    • https://hoakhanh.vn/uploads/image/files/52907865983.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/cf6f118d0ae23f6fbbe9333d74187a11/pisisebupeduxofajinumig.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/c7319c2cbe77b46e85377359db1991d2/rukabapowagorug.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=with+referral+from
    • 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_off0000fded.bin
d3fe8c8d4604e58cfbbc4c8cca79bcee428022859ad4dcd1ea1c9f18cdffd6be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 17508 bytes
font_01_sfnt_off00012c23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C23 16792 bytes
font_02_sfnt_off0001443a.bin
9d8151dde750a6188729afff9c5f05622abfeaebee231ef7247b8522731a288d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1443A 10200 bytes

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