Malicious PDF — malware analysis report

Static analysis result for SHA-256 207aaf7b8b9306eb…

MALICIOUS

PDF

97.9 KB Created: 2021-07-05 18:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9be40b506a580c68e5953873e9c6f84 SHA-1: b40df6d59daf42b13777b431ffa19c8cafe74dce SHA-256: 207aaf7b8b9306ebd0e70209173c192aad659509e4ed3bc1ee535ad122b85b2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'formcraft' plugin for file uploads. This suggests the PDF is designed to lure users to these compromised sites, potentially for phishing or to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5beb61f4c7---rakirorode.pdf
    • http://biotop-zamosc.pl/userfiles/file/87271783277.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106061805215308.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/a2s7o378g7vhpall5c5dfgap2l/jelutedewija.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f197532feb---38729145255.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f8580d82---73273428873.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c039c35cd---89232369988.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9ed1864df---dibidikotozibevujejotuxus.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb00ca90655---kijazewinakade.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe91dbab2d---tizorefigenidarejanubavi.pdf
    • http://aarogyamedico.com/userfiles/file/piwexuwavimasusowaripu.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/tvi889rgqm15s3isjoop7grb1e/30636659621.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/09c2e1889c39ba40e9cc6e2ea1a7b521/62564765109.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/lfc17opedoakmm5foo48q0mbh2/dozetetavutizumagifiru.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/n362tk9sl3l051ecrspecq834v/38262698522.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1bb7158d---bizasisekufuguwizefawal.pdf
    • http://appletechsolutions.com/userfiles/file/firovuna.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c13db1f00d2---dirajukopezasamamenorim.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090562865ae6---nudafasafavozivi.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/zirawugejenesobazafixiki.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc667be9ce---ferekubifisabolufugezi.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4cc11bfdb---40172907355.pdf
    • http://maslag.eu/userfiles/file/84483412360.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=eaves+on+a+flat+roof
    • 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_off00011ef9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 16792 bytes
font_01_sfnt_off00013710.bin
628a0b37adb40b4996e048c517db288f9d666898d1774cfcc6f6df3c76eca0c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13710 10164 bytes
font_02_sfnt_off00014dfd.bin
42a79919635b4e249e52da5a70e333d202fee62f2290aca236883ffd26c8ffc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFD 17068 bytes

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