Malicious PDF — malware analysis report

Static analysis result for SHA-256 adce2d04f4c22885…

MALICIOUS

PDF

94.4 KB Created: 2021-07-07 00:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13e2f2779a11927b04b1ceb35c0ba973 SHA-1: d32ad5b2fe47a86eeaf2cef3a66188edeed40345 SHA-256: adce2d04f4c2288595aaddf2ddbf11abe8b8fdc25e7a689f145e53d7a76e5bc4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://akssert.com/userfiles/files/10402212716.pdf
    • http://ijdssymposium.eu/upload/35056129643.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0522a95b5---55870447233.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0182a3f3d---voreliberoze.pdf
    • http://seamcc.com/UserFiles/files/78607341872.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071bafc20cbe---bizijafajujamasototejuni.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5e8739d923d2a28e7d01af59d74c45d5/janatewowukamuzojuli.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe60a91227---sawitaxesew.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/205ejij415f3osu4iuprkqm1s6/70682617091.pdf
    • http://alfavs.eu/userfiles/file/95990991133.pdf
    • http://guinyardfamilyreunion.com/clients/62985/File/84086437030.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/69135522879.pdf
    • http://ecologie-energie.com/userfiles/file/20728515314.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8b38c30879b99bc994f59e342c4e261b/masegafanil.pdf
    • https://ocw.tw/uploads/files/2607380051.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/05e819064e745de9fee92eb7e07024bd/mokifesijabiwajuvu.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/uienlmummn6e1cem19srbp70cv/kepudoxuki.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abfbd5e3c8---dijunedafewixebapi.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6b597e0e---1513447241.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d64c4953adfb8c3b0bab22b553e402d8/14434640001.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/vgbt3gihe6j1so1h3v2c4tmqmr/lulifukufukolawopizewarez.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/43918ee5ef295fadeffba1b16cd5b783/xijob.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/girulikutux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+summon+eye+of+cthulhu
    • 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_off00010c93.bin
dddc603d3b6f49f543995c564bef06fd3db7699696b5cb0732fb2b9bdf28fffa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 10540 bytes
font_01_sfnt_off0001247e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1247E 16792 bytes
font_02_sfnt_off00013c90.bin
991e2cc34174bc072b60350364e842b060ea5530428c28e0aa9a6ae4631f1b3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C90 18304 bytes