Malicious PDF — malware analysis report

Static analysis result for SHA-256 af47d3993fe1b2df…

MALICIOUS

PDF

95.5 KB Created: 2021-08-18 02:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 008f3c1432dba53edf68a55f981fc024 SHA-1: ecbc916388bd6664f4be4c62b017ade4f5a8a62f SHA-256: af47d3993fe1b2dfe7f72f7464585fcbbc695c16660b11976124783d59f1f9b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that exhibits characteristics of a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to lure users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://tese.in/ckfinder/userfiles/files/60170722065.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/872b96847b212ddef955cce3b320fd06/nebakepopudamud.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9e6af82b0848a26ec00ca468e08a4356/tudewovipefoka.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/40nimcnbf7ksh76boactjdnjg0/xudotape.pdf
    • https://tsafar.ir/basefile/tsafarir/files/89098177725.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/jekavixoxanaxeku.pdf
    • https://adepotcustom.com/UploadFiles/file/20210515015548131.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/8415ae8f662f5c782eaeaec0cad12264/42977699325.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/e7d1feb46e81f820bab4c7b0e205cca5/80423888201.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/jt180nnl03a5fna1tsgfhagkd3/50344372639.pdf
    • http://pensionpoint.cz/userfiles/files/tefubuvorukavebiwivereduf.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/abfdbd83692baf8cdad82921fdac328a/tugibuxakobazorononezege.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b89bace052---27161397128.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f5d1f9c3---77312298637.pdf
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/96599253231.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b3b697ac---10456864162.pdf
    • http://tamker.hu/userfiles/file/katipe.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e89171e11534f503cb5b554e2c68517d/96604511452.pdf
    • http://amdind.com/userfiles/file/7453710448.pdf
    • https://www.nlg.com.np/assets/ckfinder/userfiles/files/rutekemipo.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608655998c840---51004770481.pdf
    • http://zartmobilia.com/userfiles/file/20210717194419.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b750e6509f3ee9a3aaae288aeb578b4f/1173411472.pdf
    • https://mobilieroccasion.fr/uploads/file/17519713595.pdf
    • http://avsa.org/sites/default/files/images/files/zopodevonutuluxexogukuk.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52337af8ecd9283c47fbe9c6b0a5ca72/66046361676.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+cuckoo%27s+calling+robert+galbraith+summary
    • 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_off00010f9f.bin
82d32a23a066f8fe057e5717b8428a58860532a031550a698f6e9de8681b013e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 17900 bytes
font_01_sfnt_off00013e0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0D 16792 bytes
font_02_sfnt_off00015624.bin
306289059db602fd708320deda2c718e6fbd1db2926a13d23493d1842053efee
pdf-font-stream PDF embedded font (sfnt) at offset 0x15624 11120 bytes