Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff6049c365c85a0…

MALICIOUS

PDF

101.5 KB Created: 2021-06-28 06:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57216bddbd07d1706a496c9b9f2baa51 SHA-1: 34dbd183b62c3e073a210be947ee93fcb68f3f52 SHA-256: eff6049c365c85a0b14f3c8b5daa22334dfd6f115a5d42c0ad6065c3b8fcf14b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, potentially exploiting vulnerabilities within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/970fbaaff8a7a5ae629a611a0c3beabb/sofekibonagibuforuzawo.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9a9f4beba47bdd6df4519bf75df9bb61/kujinik.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa1fcdeed3---leweloximelukefexagikukes.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c43e0997---nowibenola.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/81fdc891b8ce247cc478d697c3fc273c/91385861371.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d6837118263---mipajepufevoduvumife.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/3ik76ghrpo3nfg9u73kae1knip/46160362370.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/6401533e9a62ed02a183bc96c5b39310/tumozavakoduwuj.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf37d784e---texarozezenogedagiko.pdf
    • https://presentkompaniet.com/img/content/file/6136616726.pdf
    • http://chatfieldfarms101.com/userimages/12673024352.pdf
    • https://aterhesseg.com/up_image/file/vuputogudidatukuloxefuka.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/69926462154.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/3cf5a66207720d5d66c3563186a35fc1/zupipofor.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/avhp9ljc5jlgegnri0o3gq578u/87086744391.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/h11c3ut19q4bksbshorlkucid7/33164930115.pdf
    • https://alexandrapanayotou.com/web/images/static/file/guzozavovefarilafate.pdf
    • http://villa-carlshorst.de/sites/default/files/file/17646617825.pdf
    • https://ludifrance.fr/userfiles/file/56211851859.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/669849f3510f44c871d6479c7040a0bb/2807037225.pdf
    • http://cokhibaosang.com/media/ftp/file/68193057371.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a20be5310a3---mowelal.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160877e150cfc3---faxowurekuvajekedoxodapim.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=esterification+of+glycerol+and+three+palmitic+acids
    • 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_off00012523.bin
64c214146f06ed84f3c4c17035778d9a2b2a8ebba72f6e3f3a73aa32eab31272
pdf-font-stream PDF embedded font (sfnt) at offset 0x12523 11164 bytes
font_01_sfnt_off00013ed8.bin
1b7484deb9bc10ebb7e2413dd3d054e46d775146ed9dd5caa7f2e5fb907bdbd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED8 18948 bytes
font_02_sfnt_off0001709d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1709D 16792 bytes