Malicious PDF — malware analysis report

Static analysis result for SHA-256 138d0bcbc0443abb…

MALICIOUS

PDF

86.1 KB Created: 2021-07-09 05:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e967a5e8ef32e29a2546f6d639ad9c0 SHA-1: 3421a3c94326c2fdb738d204da14a0d03307432b SHA-256: 138d0bcbc0443abbe09a43aa2e7710e23ddb16ecfe6cfe31aab829a3f98ada3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns, often leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd102e36aa6---85688278324.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/fnvqc3b4elcs1spqifnag0h3c7/91223519788.pdf
    • http://kulturazebrak.cz/userfiles/fekejetabudipevuvebadexe.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/nirikojaperoduripukim.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1090a548---81628978883.pdf
    • http://unsersohn.ch/images/file/noretibaketi.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9prjdcmlh0n9di0j24dg867kbe/jetuverogivepegarikuruzi.pdf
    • http://ttc-investco.com/img/files/29202792807.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa819aafb08---26885085012.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/sv2do96ahl0mr725qficrqfg0d/96484263483.pdf
    • https://rybczewice.pl/userfiles/file/gifepepipatodu.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8026f2d5ef---8792671733.pdf
    • https://amatnieks.com/pictures/image/xigapo.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/cieei6d7usso1i40q57e7j24so/72476142650.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5a6b674f085319760f8da7da518d25a5/xifep.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/5792117071.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b660849162d---wozabidegujisepufiwezukaz.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0oi2b1f8rbn7slobevr3ma72de/57278829816.pdf
    • https://hanedantoptan.com/upload/files/fidukidelub.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c56a7fa9f---votojutof.pdf
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/40355320675.pdf
    • http://files.ibiza-ferien.de/file/zaviraxogutizotiwipuxe.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/63016953033.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077982c9afdd---sufukoraluxiwuxopudujomif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=personal+information+protection
    • 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_off0000ecb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 16792 bytes
font_01_sfnt_off000104c9.bin
3324e55f116e6c9a30cd63c1f24c9b0823207dd3294c280e67b2b107c026d3d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 17672 bytes
font_02_sfnt_off000132cf.bin
0c8685c3a9c33d81fcbd744cec3b9d00af93ad81a5d248d1a7b38e8a8699adbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x132CF 10644 bytes