Malicious PDF — malware analysis report

Static analysis result for SHA-256 1333bde27900ddba…

MALICIOUS

PDF

96.9 KB Created: 2021-06-28 23:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2f3fb3e36b620da813f21ff38069dcd SHA-1: e1799d5c6b95643d9077ed2ce12b40c5708e1308 SHA-256: 1333bde27900ddbacfbea0db024aa7029700d0565dbc203b229e44b4c9c05cb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, some of which appear to be compromised WordPress installations or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the structure and URL findings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://teplospectr.ru/images/files/boliruwivolakepu.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c947559ff6---61402629458.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/aa256c5570d3b7bcd9dcebdcb0322321/bepelozuxagebedij.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/83656569537.pdf
    • https://aydin-elektrik.com/resimler/files/xanamowujufe.pdf
    • http://nsdadventist.org/FCKData/file/pijazuzevozofodiwu.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/op6obkqbp065iv1e8lbgub3fr5/laruvogagisa.pdf
    • http://gtshotel.it/images/file/42913842426.pdf
    • https://alnahamgroup.com/userfiles/file/mizetudoxepovekof.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73767d903---fipumogesaz.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/820fa4adc805115c89cdec2c0070ba65/dukujikekuwemazo.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ce393e5f29a76022740cc84ef042a00a/14032674374.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8168f329a---14996470691.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c726a4ccae7---bigadupixobekaraputo.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/37d335868df16e534c86e39d0e65f4a2/40053714335.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160871a59d0a7c---2800680637.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609885596f1f2---mizebotakarome.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3c217b2b18540a229e46cd424e09935d/gunoruzerowum.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b7273848e6c30d90c84f5932cb418505/kapululowadoparakajunepo.pdf
    • http://ciskmv.com/css/file/17609647248.pdf
    • https://presstone.hu/userfiles/file/11405713204.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ace27b3e628---96524658073.pdf
    • http://grandp.ru/userfiles/file/luvow.pdf
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/jiselodaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=brown+jelly+like+discharge
    • 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_off00011845.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 16792 bytes
font_01_sfnt_off0001305c.bin
d7b276728fcaa5bacd9b2934d5e6175cf7d7775208c584892d269166b0d6de26
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 11024 bytes
font_02_sfnt_off000149c0.bin
2bd541af0eb7fc584a14e3803aa9bd879708cd45bb1701ea291b76701f51712b
pdf-font-stream PDF embedded font (sfnt) at offset 0x149C0 17336 bytes