Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea8ebfa565b83ce…

MALICIOUS

PDF

82.4 KB Created: 2021-07-27 21:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 178d2cac2591c1a3a4ebc9c8b5e7291b SHA-1: e74ce486a0637ca4181330bb1de3fc52775498d7 SHA-256: 9ea8ebfa565b83ce9814d672433ff724b532699df8c3248044269db1058bab89
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and a high number of links per host suggests a coordinated effort to host malicious files or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daf28f3ba15---digiwutokulamipozud.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1ed7ef4cc774e7c4a892b956318a413e/16332258261.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/gepuwubudagazaji.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34f2f48519---zozisarer.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e392573ca6---wuwagafawimibadi.pdf
    • http://mobydick-band.de/fckdata/file/ridunufaxagoku.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/faberatunisovi.pdf
    • http://bostonmentors.com/userfiles/file/guzonado.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa91553f1d---51115896170.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a512136629e---69947502683.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a042a53940f69ad9d7e4e377c20826ad/wavabiniba.pdf
    • http://studiobonvino.com/userfiles/files/tevetukorit.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d59f5c3556738d783d7b5a3c43a4b333/87886796672.pdf
    • http://barcelonasixtytwo.com/userfiles/file/xegavisafulijugiwulitiso.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160701605d51f7---78786032197.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8af00570---gevuluwiwitis.pdf
    • https://atamergranit.com/userfiles/file/87664280918.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d5beaf9ece1d3c0dbb666e2603228974/tenifamitazuwen.pdf
    • http://smartvoicecom.com/userfiles/sulosokozapumewopufukofuf.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/787e975cd1b8d7ddc844d1e159341ea0/kapowegepuresepejep.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8a33143e---kuxerenegevijewazuxab.pdf
    • http://4x4autok.hu/userfiles/files/gitosipivurigajojasoza.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c16660924---podewe.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e951ebf40---xosuvepanarabolimiditikoz.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6aa143ba8d---90580313984.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=antimanual+de+filosof%C3%ADa+resumen+cap%C3%ADtulo+5
    • 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_off0000d781.bin
cc68fbe8edbb13779e3a76ad69e534a96f470d82ef8b2a5cbb44f58f47b21763		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 18744 bytes
font_01_sfnt_off00010681.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 16792 bytes
font_02_sfnt_off00011e98.bin
f770e2ed608972e580379feb0bc335fe6e94c696353349094fcd9a9ef28fb3c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 11060 bytes

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