Malicious PDF — malware analysis report

Static analysis result for SHA-256 a313f233cb59f0f1…

MALICIOUS

PDF

69.0 KB Created: 2021-09-16 17:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2160a9dfb068007d618414209b0194a9 SHA-1: 0b07d68e59bcf68dbf046ceb32b9dab852b031bc SHA-256: a313f233cb59f0f1a4c1baef7fb5061ea74c9fb30a417c8251d066954f4594d9
184 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristics indicate that the PDF links to external resources, including raw IP addresses and compromised CMS upload directories, suggesting an attempt to download a second-stage payload. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://veitali.com/upload/files/xiwironomapem.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396cdb9529e---vafonil.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c730a13e10587207ce63e89796a6815b/xuvovimixoboji.pdf
    • http://vom-ragnaroek.de/uploads/file/gowakebusuxolaxenatewebu.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a74191238---26197610189.pdf
    • https://bodymason.com/user_uploads/files/fabazopajuwokifuruvo.pdf
    • http://sfssolution.com/userfiles/file/54386639107.pdf
    • https://nbc.com.vn/ckfinder/userfiles/files/53865343270.pdf
    • https://ms02bet.net/contents/files/69751508915.pdf
    • http://skupka23.ru/upload/m/20652713270.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/lebufojafipijozusu.pdf
    • https://mimpishio1.com/contents/files/15896777554.pdf
    • http://didula.ru/img/file/12303088644.pdf
    • http://fluitec.fr/ressource/site-image/files/zadumivemaguligopareles.pdf
    • http://ppfi-online.com/userfiles/file/97947104834.pdf
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/wifufinuzofat.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161408cc16184e---21797665837.pdf
    • https://zivotzaokny.eu/res/file/vizesetekakila.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333d9d9be58---53891461626.pdf
    • http://dienlanhtruongson.com/upload/files/13661164265.pdf
    • http://e-cluny.cz/UserFiles/file/xenabujegiwufiso.pdf
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/77879109520.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+all+the+queen%27s+horses+online+free
    • 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_off0000b031.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB031 16792 bytes
font_01_sfnt_off0000c843.bin
e186b0734bc64eb225abb3258223b26a52d59a230293c89d61736b333799add4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 14884 bytes
font_02_sfnt_off0000eddb.bin
a99a2348515e459cba577b756ecd2562a38570b1bfc8764fcfc76c627584b8a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 10708 bytes