Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37a87001678b787…

MALICIOUS

PDF

87.7 KB Created: 2021-07-30 14:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbeb04149898f6f501b12b2a63962c6c SHA-1: b28eeb1ab9e036e6958d9db66723f88ff840d094 SHA-256: d37a87001678b78772c29542c3e626c546814af754ecc7d77b2536f163533777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://harasim.cz/uploaded/files/55688658536.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5634139c5---muwotaduluxupusuxase.pdf
    • https://bandotrading.com/uploads/file/wutefozoka.pdf
    • http://pizzeriagiganti.ro/imagini_ws/24299978383.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4b9044ca---97856442088.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/82362246818.pdf
    • http://t-eamplus.de/web/editor/files/pavojonuxolufer.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/556bd16855734515651580637bab4740/70690058171.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/j9hvjfe9pbtan3n9johboa1urq/5012271321.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/mnit25gd1t0jlj8vbe21ilv51b/658026052.pdf
    • https://aspirans.com/files/file/kunomeratimolabokajugus.pdf
    • http://stark-tools.ru/images/uploaded/37601779869.pdf
    • http://maslatalaia.com/userfiles/file/73214309551.pdf
    • http://sahamit.net/userfiles/file/11647333493.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7d1e84a37---60151779764.pdf
    • http://tlxzkj.com/uploads/file/180850283736.pdf
    • http://imaginove.eu/data/Files/muvagapotebafiker.pdf
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/90126585095.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/36312414137.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/89114822553.pdf
    • https://organicfertilizerproduction.com/d/files/66149896320.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2d6599436996983b082062942b1ffcb9/77533148767.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8ffephclf5huh05emin9s8tgt3/dafabazozonojaxelegafakos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=logitech+g29+setup+xbox+one
    • 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_off0000ef0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 16792 bytes
font_01_sfnt_off0001071d.bin
a051fb6bf6da421c4755dfbcaea459ab3f246c1029e6af12f2ecc32d6dea62ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 18064 bytes
font_02_sfnt_off000136ba.bin
72140ad5b0b5b3f78df933a8a992d11a3d0f945a56484f5622212860b1a24015
pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 10932 bytes