Malicious PDF — malware analysis report

Static analysis result for SHA-256 4803a996675b76d8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 09:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9d6db673d5f4588c381b360a1c055a0 SHA-1: 0573f3c52c70cbc3218b7fd2c777382f3f346417 SHA-256: 4803a996675b76d851680b84ba2ddc0fd36331184176302af4b15cd19613fdce
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an intent to lure users to malicious content. The document body was unreadable, but the presence of numerous external URIs and the specific heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9g6c1bq351slm5jlecrbpk9p26/19528995521.pdf In PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/tobikura.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210606195553.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/kejeregomex.pdfIn PDF document text
    • http://allasclub.com/campannas/file/zoxumirefid.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073798ff2f87---zalanijodomudodewafag.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9c17298cb6a4fc0388fcc7cf541272d6/faburikidanazo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5ff292314---88853176192.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c5635406---41714233338.pdfIn PDF document text
    • http://atomleasing.ru/media/File/torosar.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/60m3jkkkt3fujk0oi8cvl6dfat/rejoradozumezilewozawataf.pdfIn PDF document text
    • http://186086.com/upload/files/nuzevoloroja.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/sqhdj02k2fodtdq14b43jbamtf/vizejal.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/55nr9f0livvksft8jsnpmsn703/jubaxo.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/jesomexorurekizuf.pdfIn PDF document text
    • http://djpress.pl/Image/files/90838376954.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/96770566627.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/46539229280.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/78739927653.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/fepabidepofikakurufujajik.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/87097030092.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/25955224749.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/texesalitotovevor.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad893cdf4d---ruxefetofusugavuvexadeg.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/89812359805.pdfIn PDF document text
    • http://cortabellanews.com/userimages/kagofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lucky+dube+my+rootsPDF 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_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 18756 bytes
SHA-256: 94bf1170d4b8f3027f5d938c30c51bd363ecfe4269ffa1533e8ce7a0d3f92e0d
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 10528 bytes
SHA-256: 2de99cb52d6651ca6aeba632fb468f9db64b0b9d7768d7d7ee29ff1a08484d1d
font_02_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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