Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfeb80b00289f61…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 23:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49a54b07876116843e17b100b4671f62 SHA-1: e3220e1e7bb23cd22a730f73f984525b8814ba0d SHA-256: 9cfeb80b00289f61d1db6c4a1bccdaf5edc53c21d181ff4727ffb3417c575de9
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable domains. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and numerous links suggest the document is designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30802168461.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b993125cd7---783688914.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a344e24f7---ginodepirova.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b358b0787c7---xasitemazisipumeripolul.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e97eb852d---luxemewugibetotekuxik.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/86511efd7e8556bae57ab9f677345ad6/zizeguvemal.pdf
    • https://gaziemirkentkonseyi.com/upload/files/48430441824.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/i466jqu194hfvlp77ri7b0kcf5/51752890721.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/14917845266.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ke70877km90kanp8565a14ecbi/89936530684.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160798b00b8f84---dibizenuzefas.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a5a660e04---1834908783.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca5900d018---64147990733.pdf
    • https://ludifrance.fr/userfiles/file/52317553903.pdf
    • https://communeouchamps.fr/userfiles/file/tafagegomi.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c803c32e2b---mebedolumap.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095319e8a63d---64969769117.pdf
    • http://alphasigmaoverseas.com/userfiles/file/ferolu.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4fecc53c38b18f9100a4f66d795e5bb4/kiririrafe.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9bd21af3---88367062261.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966587a9299---56689393170.pdf
    • http://www.anjhimayath.com/upload/file/jafevoduzek.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/7190160579.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cheese+sauce+lasagne
    • 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_off0000e7ae.bin
019e06af14549c649a2b4fca39f8218075038ea2627eed39f6834dbb59091840
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 17772 bytes
font_01_sfnt_off00011677.bin
4f0b8612f61ce9ffb0dcf027c16c196e0192a879074925772ce226c679585de9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 10232 bytes
font_02_sfnt_off00012d67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D67 16792 bytes