Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb904cfdb64af21…

MALICIOUS

PDF

76.2 KB Created: 2021-09-29 08:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ed2d17aac128baf746ad5526ae85de56 SHA-1: 1147953c00da14a22e7a4204fede6f02db13ce96 SHA-256: 2cb904cfdb64af219fc999c540b4b07405baf616f56bb317cfe1bf61599c52d4
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 upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

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://crewmak.ru/uplcv?utm_term=kuch+kuch+hota+hai+mp4+hd+movie+download PDF link annotation
    • https://myagenda.myagenda.cz/pictures/editor/files/14536604761.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xasatexunosezaset.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302ee01a4f4---92441801558.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8b0af9db---38360213782.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/5866815722.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b61d121656---sipesijogifubamutodura.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/mikiranemeno.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/zulapezazinarudewufoza.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/beliwovubimajakas.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/33103591171.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/11067059415.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/sozutiweromipobafutexim.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/15558589788.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/molaz.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/32c865cc76893e36ca8c8478dd8e607f/27967114133.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/2886642386.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/sababolu.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/18509559711.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/logef.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/79339948477.pdfIn PDF document text
    • https://petribax.com/userfiles/file/25972659505.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dfbb7adf9---85659182335.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/salusebuvofanuj.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/vodekofixesegawon.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/buvalad.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/vekuburiwaxenewoda.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_off0000bd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD58 10924 bytes
SHA-256: a0d8b269da7d4c1081ad3774836e4ed882e7b055db84249596324bf64244c3ba
font_01_sfnt_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 19112 bytes
SHA-256: df8aa35cb031a29e014fcc0e56eb0e9b46135e952b2faf25d947c2c8d04a36d9
font_02_sfnt_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1