Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84325b4d58b46b1…

MALICIOUS

PDF

75.8 KB Created: 2021-09-03 10:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b16c3d954b19b550fc4b3c5ad7aa185 SHA-1: 49c6076065ae8253a98a54a60f8df831064e8676 SHA-256: a84325b4d58b46b1dc2642efdc05bccdd8b00a6a76aeb388f4fbdd45b07efd4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://irlanc.ru/uplcv?utm_term=recetas+de+dieta+metabolismo+acelerado+pdf PDF link annotation
    • http://come2menorca.com/images/file/vifamasevavoku.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/96752299166.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/vezusoviwevawezarano.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/62698181205.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/vawoworebesagawuguvo.pdfIn PDF document text
    • http://446888.top/userfiles/file/sinekalonusekobuzed.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d0388ed5---19912777699.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/42203382702.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/nuxobozoretaxonumiroxowa.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/getimasososunekida.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/kozerumalobutik.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/disujaginavaxegawuxamifo.pdfIn PDF document text
    • https://birudongker.com/contents//files/kufulag.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/fa3309a41c0c4f166f72fa15a3fda20a/xalagujezunikebevavomixek.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e8d32c8aa0b361222f864094288de80a/piliruf.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/40752967960.pdfIn PDF document text
    • http://minerva-collection.net/files/files/28708923714.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16124e79fd21a9---14307327981.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/vumizidetoruso.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/lubododana.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/85438274388.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/28607f1a5503d00bfeb9f07d273a524d/80973369416.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ad9b3be093df7e897bc8cbe817efe024/zaluperefubebu.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c2217316b---44186296231.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/sr7tdnkm5i6122kqb29j4901r0/56132628031.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/pupesewetirorisitotu.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_off0000c3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C4 17908 bytes
SHA-256: bed9f97a73594352beab387b4a14f8b28681bce7a84177a7774cb440fb5f1850
font_01_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 10860 bytes
SHA-256: 7c9c7e557f70cad17a449ba36ad0ee5b0b3aa510975bc46d2a0730751f17ba61
font_02_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1