Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9e85b9664037af…

MALICIOUS

PDF

90.9 KB Created: 2021-08-17 15:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e2f3cb009ca3896287685f86d883a972 SHA-1: 1400610365f8c2f9d8984b341f5f6fc55a7ff188 SHA-256: 8d9e85b9664037af70002e84dce4ec43df3f66df34dc352a31a6fbba892f5aeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure itself, combined with the heuristic firings, strongly suggests this PDF is used to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://krisoc.ru/uplcv?utm_term=neverwinter+best+tank+build+2020 PDF link annotation
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/v9k6tugbmvp3n0aajrfia7h3v5/52226675252.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160756ce3efc4d---digupiwosariwozezusaroze.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/0a24bsa4dfq8frcqm2qgg5ss4q/83603719968.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/bcr8slqv70lqr4h9g8k239lnt4/minaboredulafuve.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16119d0d2446c3---15502041806.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11327bebe2---93524524837.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31384eb9a---sanibixesajej.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/wofalan.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/sopubedugabirudonasina.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/29665136058.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f80ccf961a8---10651248878.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/22842048112.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076463a13218---rudafofelogaluwezuw.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/8108880057.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/15294824019.pdfIn PDF document text
    • https://tsegypt.com/file/neranomaxuzowuwiripalin.pdfIn PDF document text
    • http://atomleasing.ru/media/File/jegalizufotuforasomisi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610a84b947a3d---63685932970.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/terevubilow.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5a8c530b9f47df1830209b28434d3bad/fewevevubuxawerijazizena.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/82755798636.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef6b9d58e2---xovobigiwovedudulage.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/jawozenabavelededo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4abe5ef95e3ddc1413ecae97fb0b581c/zudofalupiwexexafej.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/54764321393.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/seroviw.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/jdgnjp5b8vuga7tjkl4o73d395/90773320195.pdfIn PDF document text
    • 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_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 10824 bytes
SHA-256: b02ee4489d0e5190aa110293a1645642227322fd219e2b2dc450c83c4668f70e
font_02_sfnt_off0001320f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320F 17152 bytes
SHA-256: f7cd16481cd65d4f17e762a622a12701e60116054146bf01e1da6d18503a6f0d

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