Malicious PDF — malware analysis report

Static analysis result for SHA-256 9042ad297bd6b42b…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 08:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 340d1ec3b3adda9dedddeed9e821476b SHA-1: 9888d47d51fbddc8870ca2b4caf13c16da741fd1 SHA-256: 9042ad297bd6b42bb1a1b9ff09f8fcbd791471b22941007649d155961e839cc8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The presence of multiple external URIs and compromised CMS upload links points to a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://laborke.ru/uplcv?utm_term=verbs+with+letter+k PDF link annotation
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162e5ae970---79735956735.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/42445978282.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/64002723043.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/xameremanozuledu.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/latumagetomofo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5b63fce7dcfc1575f8f2308a2fda2c74/68420294939.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wazazeku.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/59848246290.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/wowawolome.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/vusumibedudemixali.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/futedozopejukegun.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/zavasixejesasa.pdfIn PDF document text
    • http://effektfilm.de/files/file/11575339538.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/jereseworowixurofupipuli.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/18738300548.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/14770688352.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161308f93a59fd---37127281867.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/sowenuxasorowiwofujupaxu.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210919003236518.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/jilomogek.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/getilizovafuvuj.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/29681969639.pdfIn PDF document text
    • http://strandedtattoo.net/file/susumezawupi.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/bavitiresunijoni.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a4fb5f69a9e20a01c710791237b6e4ab/21224566344.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_off0000b507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB507 14932 bytes
SHA-256: bd15b92b9d58718945a04dbc71cb4b12fb916a0fbe4ac833e6786db256fc1333
font_01_sfnt_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 10104 bytes
SHA-256: 3bba7447d9626cf2cec8941178865e4089c4a55cfea66b07d2407d0f1b8b1b71
font_02_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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