Malicious PDF — malware analysis report

Static analysis result for SHA-256 7801c8689c93ff6d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 04:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 433f09735c38b8c0acb6f7d74eab7ab2 SHA-1: a66d0db06b8f54cc52cceed149115ae15df81f49 SHA-256: 7801c8689c93ff6d04bf29384c331cd244a7d19df071e800127186b061e6cd4a
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be disposable or compromised, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure suggests an attempt to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nguoigiupviec99.com/webroot/img/files/pifekasuvawixalumudat.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390e96bfe0f---dirovowanekavover.pdfIn PDF document text
    • http://reichspfarrer.sk/file/xisanelimalasufe.pdfIn PDF document text
    • http://prmakeup.com/Image/files/47939542219.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/tirulo.pdfIn PDF document text
    • https://vendax.ro/files/file/42361478883.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/31390908976.pdfIn PDF document text
    • http://mweb.cz/images/file/27032234498.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/17168706464.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/rejogawebipunefixitogij.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/87611432339.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/pikoli.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/1498554830.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346706d1674---23242139895.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/2516958392.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139b59aabf84---99340991645.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/pufiw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab77773ec---685157970.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/3946647349.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/nedefatuxenexalufidazi.pdfIn PDF document text
    • http://datcat.vn/2018/file/19836509795.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/jabeterinovem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=messenger+no+chat+headsPDF 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_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 10504 bytes
SHA-256: 63783530ce3b8884587f04a27fbd17d90a61fde1005b57f0cef6d68de8bc7c9f
font_01_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 18484 bytes
SHA-256: cb99cfe340cd92817168ec10406447da71fc34209bd2ec6b1e098b21b5b47e33
font_02_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1