Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dae919c6decea3a…

MALICIOUS

PDF

71.1 KB Created: 2021-10-06 06:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb7981dd16ee194b22043ea28db0e786 SHA-1: a3e07b94ec6577dc86fc0ae89578c81dd2c5a235 SHA-256: 1dae919c6decea3a1bc86d733b05f6b9518ee542084f26a012038662110b2ed0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking direct user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=need+for+speed+most+wanted+2012+ppsspp+download PDF link annotation
    • http://aihyang.com/userfiles/file/gasefuvuxitemunus.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141402a23a7d---vexegotuvegoduzomirovevo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff2125c2fd---sirenuwisipo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/77cd7d6a591a7a978da7a6e538fe523e/zarujibel.pdfIn PDF document text
    • https://cardolf.ro/files/fepuxavowanetej.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/gemaxipoluwopox.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/revux.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/temoxisinekerewodedoxol.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/6762692689.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/tazesupolobiwiden.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/wajolirifafonaloduvaf.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210911190915.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/valoviv.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/xipam.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/raxirodavafipedo.pdfIn PDF document text
    • http://taxfreepoint.com/file/jukenusaw.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/34328877471.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/sebijukitegen.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/23985392179.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/xizetuliwizibudibugaw.pdfIn PDF document text
    • https://brukspec.pl/upload/file/tibofudaxaxunotewo.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/68760814869.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/77491695221.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16140395f8d1fc---jerewewojiwi.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_off0000b46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46F 15812 bytes
SHA-256: 6896e20d6ca7d16374fd595bd6cb5c93921eaee6ee7a08589374a455523ba378
font_01_sfnt_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 10924 bytes
SHA-256: d8757bcb4dd4a8a857039afcd8d9d7fe5026b3508ceb53bbe28a1c4ffccb1f9b
font_02_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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