Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7159cc2dfaa828…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 05:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f85e8d6557c4a2089d7f0ed6513c3761 SHA-1: e34d38ea0383530dd1c34c42b39fec6697463f45 SHA-256: 5c7159cc2dfaa8285cafbe0354911bcfeb3aaf3d7b42cc690c08855150e30179
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, suggesting it functions as a lure to redirect users to potentially harmful content. The presence of a link farm on disposable hosting further supports its role in a malicious distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=you+are+beautiful+and+amazing+quotes PDF link annotation
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3218d1be7d---95981862905.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/4avai5lkdeu4o42fid4m7ucnr3/31063530585.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/rebuvenivilo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f111e09bd2---70434296693.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gotenalujuputewavagoxe.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0de9f6fe8d0cc2d4ae879d7bdaf19e64/duvawutigaxikezoved.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16115efed21792---66621315883.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/36143636303.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/pifuzibabapixipexiwa.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/78614455065.pdfIn PDF document text
    • https://agatanorek.com/files/file/ferafobizafinatapozo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/11cd73dbf234e9c8eab64fed86ffc228/japezugij.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c38d50bb75---5527447610.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/jarodulodilogolonebajemet.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043008461184.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609036d556ee2---29008701221.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2804bbc1---69378655931.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/zafawi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f1aef5d2---waxaduzod.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/ruvolino.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/33326240497.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1b88b8adb66430f9e61126f008c89e3d/23596814175.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/pozapomuv.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/zakizokumupem.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_off0000c1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F7 11128 bytes
SHA-256: f5f931b3b84ae88cf469fb6259aeb17659d42a787fcf97fb21a714cdd5dd92f3
font_01_sfnt_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 17504 bytes
SHA-256: 7ff378a4d0a30c9d145ee9e284b1745536e03165f6194a87640055d7ae3ea61e

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