Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c89e9ce130bdc39…

MALICIOUS

PDF

90.3 KB Created: 2021-08-05 07:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55f242a8feff22448b520612f0f97429 SHA-1: be1810a740ae140525830f54e72bcaa554845300 SHA-256: 1c89e9ce130bdc39fd5b6d6517ba2cb43dd77d6785116724648235b44ac1058c
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 sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b152f1dde---71843137502.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/nlg521hrpl1bv3irtleeuqe3qn/rofowefuzokekipanesuluj.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607220836c718---60244351094.pdf
    • http://olddieselparts.com/ckfinder/userfiles/files/zefibi.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160983683bdb1d---vomisep.pdf
    • http://handbook.hu/upload/page/file/63982457512.pdf
    • https://aydin-elektrik.com/resimler/files/18322372194.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/45646078177.pdf
    • http://rowsontw.com/shopadmin/upload/files/66370499560.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04e4ef33fc---tixabekipotujoxul.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/4cf1uu201ou0uhsu7v6f8ukjdm/35437587680.pdf
    • http://topoint.cc/userfiles/fckFile/20210618004351.pdf
    • http://gldbirdgel.com/user_img/files/gexinafotenewakogap.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088a5f38f0db---97208975258.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69629488237.pdf
    • http://akcjonariusz.com/UserFiles/file/mapeniverujixofejorakof.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c673e287d43---88443910663.pdf
    • http://makinsushi.com/uploads/files/39006612242.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a36eb029935---wewodivesufexim.pdf
    • http://akinmedical.com/uploads/file/xiwidojefumozudu.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/fcf1cf707c46e790d3750817999c6e77/61165601666.pdf
    • https://visualarchive.bg/files/11654552714.pdf
    • http://eko-gospodarstwo.eu/files/file/bekumexututosafa.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f9e1d1bb---70245027698.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/197ff8b3f9e34f6b0e3b4c4fea1867df/88375748543.pdf
    • http://benthanhsgfarm.net/images/uploads/files/verasulawuritukuto.pdf
    • http://enslev-anlaegsservice.dk/userfiles/file/webekiwijamexubatorolewew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=b%C3%ADblia+catolica+explicada+vers%C3%ADculo+por+vers%C3%ADculo
    • 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_off0000f5f5.bin
df23754ec03d283178a9ca6a6c9c0279c83e37dcd9b61e265899016d81af5827
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 20048 bytes
font_01_sfnt_off0001267f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1267F 16792 bytes
font_02_sfnt_off00013e96.bin
d431b90bafa39f48c9c980fa90e176151544b2521bc789a86f35f4ca488d15d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E96 10924 bytes