Malicious PDF — malware analysis report

Static analysis result for SHA-256 325dc7dd47154240…

MALICIOUS

PDF

80.0 KB Created: 2021-08-30 07:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: bbe970febea95e3738aadba1f722976c SHA-1: 3613b5bc1ae0488334a20a63fc774a573b729887 SHA-256: 325dc7dd4715424014ea63bc46294ad5852e40ca85a10d85640e9475e4702094
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to lure users to malicious sites. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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://anjilh.com/uploadfile/file///2021042921582545.pdf In PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e61ebc44d6cce72770d6a43794549b6/wenivuxas.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/74376786378.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/fuwanalosopukodidejupija.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4047f37f03b3a0105be6e205a1a6b0fb/jozegevifekamimepud.pdfIn PDF document text
    • https://sce.tw/uploads/files/60c42d2f63661.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/68328256244.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d877913dd---62384639641.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607da298a29d4---tabomojowiregazijobesa.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/eivgtc5buuf52greschponkvfl/65787080647.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b575d23ea51---20650053795.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/76970412433.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/dodovemetakegamesoruda.pdfIn PDF document text
    • http://juha.be/_files/file/dulorepupisez.pdfIn PDF document text
    • http://waterreducer.cn/d/files/ponixiwabifal.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/537d5a44d2e1240bc0812848bbb7d39d/13778052175.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kabirabiniloged.pdfIn PDF document text
    • https://2acontractor.it/images/file/87678274744.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a292d7ec3a4---dolanovaposafolir.pdfIn PDF document text
    • https://businesslife.com/content/file/gunoriw.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160940fc0a372b---gavadikijenowaf.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/bedae3f38268bb981d0acc3ddd5f72df/xekelipul.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/9e735935c264c1c1b45e26b7b8495b7c/66809992510.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/lenepasikesuxobumes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=haryana+is+famous+forPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 16200 bytes
SHA-256: 00bdf253932d2136436787afda199ef1c34261463a471dba57db7c5a74d841b6
font_01_sfnt_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 10304 bytes
SHA-256: 90019c8894091c1a5afa439634586e68ff1b0e42362064f75d15aec29d941f68