Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ca6a9f7781f8ec…

MALICIOUS

PDF

87.8 KB Created: 2021-09-03 16:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3453a2baa065b8652980e40fc718522 SHA-1: dd2dbacaee6d3587158524ebaa15cb781e47b9dd SHA-256: 86ca6a9f7781f8ec23896bea46559453203de308b1db3eadfe89bb9629c07731
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links to compromised CMS upload directories and disposable hosting suggests a link farm designed to distribute malware. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is attempting to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=phantomjs+node+pdf PDF link annotation
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a20f44eb9692566ccfed7f283ad30f9d/rufaxuvikalomupobedum.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/e6ih46furb021hsb53d4pkfpp7/37122611590.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2264310a33---dofafaxebivonadesobitive.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af469921ba---mukovosapunozenomo.pdfIn PDF document text
    • http://asvpp.fr/pdf/pexegijekedadizof.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071bfdd58895---68667975116.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/lisuboxujewogudanakugome.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/kezabivesexojat.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/87547619668.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/80737219303.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e40aa4221c4---5776227818.pdfIn PDF document text
    • http://waypl.pl/upload/File/96354651547.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/tewoxanoziwodonel.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/xuvoxejavafuzasara.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/bokidewulegejebitiroram.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210630041635.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad29b899ef0---72289761193.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/45348537895.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df8470d4ca---44697183746.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/15650316571.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f2346e449af91a049863877bfeffee0a/sovewufinatimofij.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/8bf56e4778b5dca5d24f5c9bc25cf377/fakesidasezilume.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/93258433560.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_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 18900 bytes
SHA-256: 9566446f8eb84c754008ee15db74bb802a31e400733b7c9228289250b2fd3ac6
font_01_sfnt_off00012194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AB 10656 bytes
SHA-256: 7945afcb2ed584e372bf24d4252e63cee2ea6c576f55e409c9f46f7e3c9db46f

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