Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eae8db9ced87fc…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 05:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba2ac31661651273217f193240e7fd69 SHA-1: 285e95a3d1ead41894c3b2e9927d2988f38f664b SHA-256: 21eae8db9ced87fc2523b615f67fd9df6777d62f7411e9e911ed60e933202f83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, likely to distribute a secondary payload. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading further malicious content, possibly disguised as certification materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=sap+mm+certification+questions+and+answers+pdf PDF link annotation
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe797acfdf---lidodekekujawut.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/81e3577a683e8f0b50e9f3eb71653445/16287595670.pdfIn PDF document text
    • https://maturana.cl/upload/file/51146677011.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72fe9f2d8b---lesiwenazeme.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/72651760774.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/boxuxamisurofawozur.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81284681272.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c73d523957---45789264489.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/65872583420.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a600289675c---25669134600.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/13240919520.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/42245124846.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/bk1vqtdsu90p214akgj7nbgqe0/74665125232.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b813273d8---mijobimezejipekitiviwewi.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/81113339742.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/ee79902bd3095bbecacc71772b78171d/zimuloruj.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/98385586534.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/42568522090.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/76542610385.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e5f82c5debbbeb6772154653e66748b5/46276461169.pdfIn PDF document text
    • http://ippon.lv/uploads/File/sogopopiwu.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/53890041980.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac6cc95db8---79527605313.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/45782157018.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc2d16dd8---guwarizakuvenademijirogu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-5/20210505190636784564.pdfIn PDF document text
    • http://artside.org/data/temp/file/58458359435.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_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 11140 bytes
SHA-256: 7f14ad00e366bb724c22b46df8461dd90e2858acdaeedfad790b1deb52be632d
font_02_sfnt_off00012a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 17712 bytes
SHA-256: 58b06d923b6a5ef91566ef043e4eab076bbf04ab35aafeeb551c6939f65f1883

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