Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc713f3e1b50f24…

MALICIOUS

PDF

89.2 KB Created: 2021-07-01 18:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f55e253a8ae80829f65e038586a4e1ff SHA-1: 822f6e8585f4abc271437ed4950ccefa154e0850 SHA-256: 7bc713f3e1b50f24e57c31f2a58644736f45d583a49f080aa5bb9a819f9dfa12
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users. The primary attack pattern observed is the use of a malicious document as a lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5f61ddcc---vufawutos.pdf In PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5500b26f10441f4f95adf6cdec3becfa/32197514078.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45f3f29da---wafajimege.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/84056698654.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af07e77526---lezabalifori.pdfIn PDF document text
    • http://armanetti.com/images/50801489592.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/29b43b7455c17ecad54c0020da5cc3ad/tofepofevazawubavofusowav.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/cd1f393f814eb1754423d8923ea56c07/57369483748.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160905bfcebed0---kuvikabub.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fad495a477b8f3f5d792f53b89fd5e17/49002074226.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1sugcsb4lpjk2jls29e3khchtb/xusatijinofab.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/vulaponab.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b0c5ebcf22691ca48ebab9a726a629ff/tigewizogutasajojasip.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a30deed3fa---nanuzeleniposozunabi.pdfIn PDF document text
    • https://italvaping.com/file/89589924707.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8b0ba7bbc---5259349725.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/45d00651768fdf19d7ad7c33056a3bd1/93449392736.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8064069d04---9932393149.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/luputelivowujesa.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/f672cci4qims3dg31hvgho73vr/17034285138.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/piguzesuvipofilur.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/121d321724da96d8d61d52197d5bdeeb/75124049705.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/2594135065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=icd+10+code+for+left+groin+painPDF 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_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 16620 bytes
SHA-256: 71f0ae313c98497f425b4ff457c9c302d8248edb623ff45b87b0f07a03c9dd5f
font_02_sfnt_off00013f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1D 10752 bytes
SHA-256: 498e4345a5e18a0858f2bd7bbf1855a44a24507689300b6af1b151a8777f6e50

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