Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f372571a5316f0…

MALICIOUS

PDF

85.2 KB Created: 2021-07-13 04:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a750b3be6c0c1648c33de2dfcd9435d9 SHA-1: d5b49a194c26e553f25b9eea2c7aaf1d8d92147c SHA-256: d1f372571a5316f0d89e8febd424e1dae380f88756aaef2eb5739b123cd0c553
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f26c93561c---50662227278.pdf In PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/cvn4htc9pg4k2eok1nrvmd87j3/23848149451.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/tejibu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/85651936087.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/13738558003.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216191120555422.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5uedu39shnn77bo10n3v39j8vl/10143949603.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/fifalajawuzo.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/64061211448.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/tiwofugabinukavosufegaxap.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210708223400_sg6uu1.pdfIn PDF document text
    • http://cga82.com/admin/File/vulitozomekov.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608937d5d04a5---xajekexogaronilumojafupeg.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc55a7fbd2---fedemabalap.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b50ecac56---58395720149.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/e6n17j1oc9dkt51tv5qv1a62r9/46449306366.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/76347413152.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa51b365446---55397569869.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d6fd5d8dc---78955910984.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/97186356581.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/64352393703.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/fiwujobinuwejumadosuwelo.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/57649069041.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/a6fk2ni164mvapn8dq2rq7it5m/96520149393.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5e721db8---bukotazivujevaxe.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/dinasamoramefirenem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=systolic+blood+pressure+too+highPDF link annotation
    • 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_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 16440 bytes
SHA-256: 0406ad4fb89c7317ff5621ef61a3d3e53ddf6361aadd8dd4f165132f5f881890
font_02_sfnt_off00012e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E94 10956 bytes
SHA-256: 12e6388a9787c913a4e38bf00a9f6a6c5c345b72cabb724a7ee8ffe5fd4929c7

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