Malicious PDF — malware analysis report

Static analysis result for SHA-256 257a2b8f1ff2c7e7…

MALICIOUS

PDF

74.0 KB Created: 2021-06-25 20:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5112f0e728d2f032500a9166bd574c3 SHA-1: 145dea192eb02ed27f6e39a256f4426b0e4f5007 SHA-256: 257a2b8f1ff2c7e7908b552c0c04ef11ae41215c090ef8951ad2bd5291521627
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of numerous unknown URLs, many hosted on compromised WordPress installations, suggests the document is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082c6dba8fb1---befizivejusilanunuxufu.pdf
    • http://www.jindatunnel.com/up_files/file/pofuwozilolodimiwi.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5f6040e2---gipugiwubexepufejitujegok.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/hun9qsc1a7quajvjjgt1462o71/7535791036.pdf
    • http://ibtaker.ps/userfiles/file/69204846808.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/oj1439mhq4huhipab2g4kc5scd/bikevufijowasizufuliwopa.pdf
    • http://yejida.com/userfiles/file/kovevaxoviseferigojeja.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/xigid.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711fe713997---68679972965.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/6id75vdspp42m9m8dc5bl3aivs/jevoxutidutiwovo.pdf
    • https://myphi.biz/nbloom/fckuploads/file/davidumatikoxajogelinafo.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3gvr7l558l2bblgmkiucc01mh0/46063476664.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/42399395277.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/67958898241.pdf
    • http://caffedisanto.it/file/dedikubidexeze.pdf
    • http://dolphinegypt.net/userfiles/file/mepagomujukejujato.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/96230564932.pdf
    • https://acryl-bg.com/userfiles/file/8174087802.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/afvuqsaahh1enbf5ui74770ct0/79383341310.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c94d6c5a13---45389451640.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ebb60f3fb---wutufogadezibidinuzakod.pdf
    • http://rustproofingottawa.com/userfiles/file/nuxolire.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=toxicwap+videos+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0be.bin
4f70a3a48a3c249ea7bca41cb9107270a51b01cf332130929805b1712f61f18f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BE 16156 bytes
font_01_sfnt_off0000ea87.bin
ac4bc98a9a0f654966d68470a0acf8b74c0be792c05468c9ecfd6baf8bf1b723
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 10528 bytes
font_02_sfnt_off000102bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 16792 bytes