Malicious PDF — malware analysis report

Static analysis result for SHA-256 136fc29271cda825…

MALICIOUS

PDF

74.6 KB Created: 2021-06-27 01:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fc1d64bb265a2d672f47e453c38abfc3 SHA-1: 6342e1a8e73acc65a2fdfb1fa618175697ec7045 SHA-256: 136fc29271cda82552433bc763bd18cf9aeb6e96134231b0fc34cfc0f02c9eea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or trojan delivery mechanism. The presence of multiple compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=online+shopping+project+in+html+with+source+code+pdf PDF link annotation
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/0e9d38972948660334c2bcc4ce3881ed/53313246341.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/3c9e8cdc9072eff4095e9bc7297e5560/bupokemozuzorinozufuvewog.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/9dh61ic68qhjc6ufpl2ong20vm/61335173274.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/e266d30c0f9f668225c2a182622171b9/xavoxevivuwiv.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f21d2d5d7---nevagafarifakapikozofapu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/79360862924.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/kinetevufepipe.pdfIn PDF document text
    • http://rld-carbon.ru/file/rodebulojakasaxa.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/girememibenajilelelile.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093af0124203---nepilekojupe.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/lexogotuwasaturepa.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090308f9d967---60623575269.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608229bc40053---34489585148.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ead7f33b03---gorepafekek.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090efd8bbaf7---piluwawitarawipado.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/jifebuvin.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/42304263045.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6630c3f4cb---nisirolopetilaju.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/50314265178.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/7049353145.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fa84d159216efa0037c87bad0cb4f539/tuxumed.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c80a2cab2---pinefilum.pdfIn PDF document text
    • https://sbufficio.it/file/mexarazovuwekotubeven.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tapodixaje.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/66fc2f23e11bf35e41be1d0959cdd552/34547632939.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abfb6a44b28---1947267626.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_off0000c1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B2 15920 bytes
SHA-256: 79687a8213a50134c060c69ac83e5c19e63e1d7c4ed206256120b7e7391fe93d
font_01_sfnt_off0000ea54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 11244 bytes
SHA-256: f9c5c2990e7f2fb9aefc352f5b4bbd21ea27f5a5a42ace7db74882c1d6b46636
font_02_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1