Malicious PDF — malware analysis report

Static analysis result for SHA-256 2188320411e0e7e2…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 04:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aef26510b46752136cfb747206c529fd SHA-1: 4b514d7e82db757965dc1b8860f0d8114a330cf9 SHA-256: 2188320411e0e7e238d9e720b0a694d41935b6d54892e7b97afd77691cfa3372
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and URL distribution suggest a link farm designed to redirect users to potentially malicious content or for SEO manipulation. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://shuswapladystriders.ca/userfiles/file/muwakumarevamuxexutatatu.pdf In PDF document text
    • http://frezerovka.by/images/fxeditor/file/51505692769.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0775725068---sowutel.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc0dec391c---1649438917.pdfIn PDF document text
    • https://flomogroup.com/upload/files/korezabavibifefodira.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/24993006337.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19fe49e2cb---xizeposogazokujidex.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/486a3cd2eb603d2f27b7c62b65f502e1/bapadusud.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/e01d5c2pp0gcldkujef9h16uu4/gunojuturesisop.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/lujewadojavirozifudutojez.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/domiwovulefixakiwetogukev.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/vubelivowofo.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/10347175965.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/36040168148.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/juwopukawedatofawunam.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6200762840.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/15933998013.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210626161459.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4459cb17783f6443dbbe227feb1dd6f3/35847911803.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/2108181850093464185j2o1xpdgkdt.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/74bdbbb69c3738d88b2e69816bcc9468/bibaratujorozilel.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cabb46f898cf67eb8dda52091199f79b/xibukirepaponi.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/47471131979.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/waxawifelefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=launch+creader+4001+manualPDF 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_off0000bb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 10468 bytes
SHA-256: 05e5503a6e070b20cc0b7697bec945eed366d3aafce792045029ae31884132ac
font_02_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 16876 bytes
SHA-256: 57a4f9d92f6161ef41c22beae8da758823635b4226f225caf6d07072f4f56181