Malicious PDF — malware analysis report

Static analysis result for SHA-256 0956b0f3fdc57b74…

MALICIOUS

PDF

93.1 KB Created: 2021-07-08 03:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fefb69216df1173a007a7747c193d655 SHA-1: acec788d3a2a1661cb02b5a61b0f95a6df224e5d SHA-256: 0956b0f3fdc57b74a0644d1af7a718930d359023c787c7b4ffd666889e5e6b53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to obscure the ultimate destination, likely a phishing page or a malware download. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16074991422bd7---sageniti.pdf In PDF document text
    • https://emauto.lv/index/images/up/file/rojelefupekojikulej.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec0a9b60b4---57729213411.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/tokaxumijejanulet.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210706032516_pkgwfl.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b66ad85b0d---bupejilenetokokof.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/03906c5ab382ab379386707554b5bf92/62853113048.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/93d762ah02phek5d8d443kf4q3/suzuzavezivifidarugag.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4b713952b27a584366118756a5632b9/77456088889.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/962d763782b435c4095e0363cf15b83b/wewiregijevunuzebugebud.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073640c5c828---66580981674.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d2874b37fa1---gadatogavolelimedalegewef.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/mowotajaguda.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/84289091768.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/31060111230.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23d766cd0---87977898339.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/13475529356.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/164f9kn6nghmep85imltrg9mrr/62766341302.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/0471414431cb26e3d98f13f016e71687/52481781529.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021062700153173499.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/82235035372.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/41681906570.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e55a0a041b2---fopofaminodim.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///gesisor.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/9801799850.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/bazebugomizalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+comment+on+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 17844 bytes
SHA-256: 7185b93e51e03a0388ebb0899d965441260a03e3d6f7fcdbd3339369eb050dc9
font_02_sfnt_off00013940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13940 10288 bytes
SHA-256: 51219e2d03e7cfd627be972e4ccf9a46818cf9eaf33ea1520ccd5d93c4215b1e
font_03_sfnt_off0001505b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505B 16344 bytes
SHA-256: 756b691c13b983eafa03e47aa9f0b6ad58d5b72d5a208688d70894321573a878