Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1549f13261ebedb…

MALICIOUS

PDF

135.1 KB Created: 2021-06-29 10:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 350e4efdb56d28b87d0762517d26fd55 SHA-1: c0b1729abc0615d1e25ca8731f612776a77981fa SHA-256: f1549f13261ebedb34f5fc31114d8db56947b283736c965bf15785b7192fdff7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://semagro-msw.ru/pics/images/file/33639298083.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6318860ce---55448942335.pdf
    • http://rolmech-strzelno.pl/Upload/file/75975186656.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160798b2cad41b---23531924043.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8bc834359---gexerisenivesukufajezo.pdf
    • https://mednet.mk/public_html/upload/userfiles/file/34322529970.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/q3qvfiom3imfrgnosheqtfpoon/36526553320.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9dfd87198---15246616888.pdf
    • https://luathoanghuy.com/uploads/files/47354117206.pdf
    • https://apsco.ly/userfiles/files/xakixivazojazodozu.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/wabariwusosemutixikob.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0701a4c6f1---63506289022.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/3ccb0160389fee3954dff55c5eedaf3f/vaxekisuzeromesikoguxax.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/83eeb3c69e190067a3f4be10771d8a1e/wogosusagututaniwepo.pdf
    • https://banghenails.com/upload/file/runofunevoterozaziburape.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9904d38455cb27a852c972294336d146/94315492279.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4cb0043ca---wigolewumuzalakigolu.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/15a6c5e8f0a9530991a0b776ca369803/47378330357.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/oj5tfe63h1usf59dvpsffeon62/loguxup.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bebd64ef4---70041073611.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2498564acaafb7b2aa26c804d2e2fd75/jurusitepigupopij.pdf
    • https://aquafilling.com/userfiles/file/34198309698.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bs+hospitality+management
    • 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_off0001ae56.bin
7f3f8469f4136e2b2c1a00f20eb9666e026ed1292b4f631c1d676864224ad5f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE56 10768 bytes
font_01_sfnt_off0001c703.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C703 16792 bytes
font_02_sfnt_off0001df15.bin
5058c796d63a5e19b7d41c807165763eab57dabbbcfc727195b51b35af896c24
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF15 18320 bytes