Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1302222bf27e524…

MALICIOUS

PDF

90.3 KB Created: 2021-06-30 10:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d8c65fd77bb8a3d300eb4b4d19b277b SHA-1: ec80d8f7244a68693a313b013cf23698439578e4 SHA-256: a1302222bf27e524901629ef25fb10756b2b19833541caf62634a42a80e93c0f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://rjbmachinery.com/d/files/zutevusasusibelok.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e0d72f7a8d04f7bc09299eaf140a6255/wukagoz.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ej2njdm0lp1gegsf3gldrdjhns/75993543225.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6376ba1b4---tirariwasenupide.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801b8088251---jejiduririjorod.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cfed550bd---67090621133.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074adcc9d7eb---tukamejobasakopasegoxebix.pdf
    • http://gustosandvic.com/ckfinder/userfiles/files/kiralo.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16077496d8113c---fuletikak.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f35272773---32175974831.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6d38db53ea32f161c843fc48e02a2dd0/fuvabave.pdf
    • http://banhangcongnghe.com/upload/FCK/file/51892576095.pdf
    • http://madmojo.com/fckupload/file/48273329661.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ucdj0cvi7uj13sqflq1fqef6bi/xipivirepuzen.pdf
    • http://interstyle.org/content/xuploadimages/file/47166866186.pdf
    • http://4grd.com/cmsimages/file/83494788796.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44b56965b---koxiwesinibo.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/70230864677.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c5e1e47c6ffbff56e9512d079ec73fd8/vobebapatafojaxalawu.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160872a1d7e742---5505807647.pdf
    • https://groupunsur1.com/contents//files/48116407141.pdf
    • http://gerd-pollak.de/userfiles/file/nefixumolusojaxemuk.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607718ae4a91a---zodelivojokijafis.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d5aa0319a---97049116279.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=thangamey+unnathan+song+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b4.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 16164 bytes
font_01_sfnt_off0000f92b.bin
76c61af96cf45e9d904a0e33bf46ab06d83a46770df2b27911d9cc671518ed08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 10764 bytes
font_02_sfnt_off000111a6.bin
4cd31045bca3d58ee718b4a24c38f32f71a101682558bcf950923128f3aa40f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 18120 bytes
font_03_sfnt_off0001419d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1419D 16792 bytes

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