Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0858c22ee0ddcf…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 03:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e6885e5ab111c5f0b47d60474a410a5 SHA-1: fcdb12b6c05ba8ce1f8a9834f3707cbd4d7fa9ab SHA-256: dc0858c22ee0ddcfb0899f96477fadf16ac8ea6f7ad3ef8c58aa12186ba71f63
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites, a common tactic for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/63a9410f31f912c568e92324c1bca04c/32586631340.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5abf27469---bodotubefulumivanetegun.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/zagurelapumadirakumudubib.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/muloxiwedugazi.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/9766468749.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/0f4hfe6qjajqsp73qs0p8tb9tegf23vd/52656529732.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7861ec83e7---67786504937.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/tms91ac6qaklsd86fetgsmct07/kazamuwojefor.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/18214663183.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c95e0ade68---febikapoga.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/60722717960.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/keguripadagikademorez.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/05211b91f3f1fe3703ef9f8ede3cf2cc/xiwemuxamubavow.pdfIn PDF document text
    • https://giasutainha24h.com/upload/files/xagago.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf5eb2b85---74993250211.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/353i1ditgkmm50kd0hv40s868h/13901031731.pdfIn PDF document text
    • https://stopserv.ru/files/file/kipunapuzoxusil.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/fozur.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608afb9ff3418---77164265980.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0536b666c8afe0bcdc9f7410f19af67b/xaruzosuwe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/o7aoaa7l1knaqki76t2ojemf4s/garasuwemila.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/87604836767.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f1789ea138554674f34970d854d24baa/juxubanirigaduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=non+shedding+dogs+for+kidsPDF 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_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 10396 bytes
SHA-256: 344f637b9c701ee9b6115f4cc707b49f09f15550ae0b2af64f2f774abff2dba7
font_01_sfnt_off000106a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 16660 bytes
SHA-256: ed471162a3027de4ce55eb0359ee7f01855ec421545f02af52a54178e0179776
font_02_sfnt_off000131bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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