Malicious PDF — malware analysis report

Static analysis result for SHA-256 3398057f3c87a9b0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 22:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1fc01913f270de48903988ef86d7d775 SHA-1: 283d6a469b0f015c9b315c00cbf349f1eca0c0f8 SHA-256: 3398057f3c87a9b0f5e5358eaadd905c6572edc68c3842016980f522d31d1355
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is used as a link farm to distribute further malicious content or phish users. The presence of multiple links on disposable hosting and the use of UTM parameters further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pistant.ru/uplcv?utm_term=helloworld+application+in+android PDF link annotation
    • http://robalton.es/Albums/images/file///56961830628.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/fonutoma.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/19971733898.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/aa36a53517ec8cbe1d6e51ffa0101d22/23875894807.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/sefutipogusuxusizim.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/67623784980.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b76317b89---basidikulizizuteripenu.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/10658630035.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/divalemawaxopepafozuk.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425f1aecff7---duvapiwarunimoruxur.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/dujib.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/68964535541.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/9819532389.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zavevuna.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76281105653.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/bulirudedaxuv.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2bb250177---didebutazez.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a8fa7c1e2---49028293504.pdfIn PDF document text
    • http://deforma.it/userfiles/files/xaratukadovubizesibituwa.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/43027498260.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cdda42bb3---gagagarukazinar.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/lde6mdg2ch67dcul82q1ielmu3/bokowapadexulasifinit.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/38501309844.pdfIn PDF document text
    • 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_off0000d0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CF 10416 bytes
SHA-256: eaed4c7a903678b708bf429db93d6442baf4ded1c6ad3fa9e2571b5627ac2e60
font_01_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 18256 bytes
SHA-256: 709496e5c6cb9896a9bbfa17c0bc5f6de24e26616cd1d30fd725af19a2a3b455
font_02_sfnt_off000117a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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