Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2a789471c946b7…

MALICIOUS

PDF

86.2 KB Created: 2021-09-20 23:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 374e5a3f6d53ebd73b5e17037f23a2bf SHA-1: 01ce79cc82cd384dc0905040a01cf337a4909d24 SHA-256: ff2a789471c946b74245d0743c332577e09c642571637d24def7a871d9efc159
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of 'curllsml4l4np7s7bkl37emg/63727413977.pdf' in the document text further supports the use of embedded links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://incense888.com/uploads/files/202109022233184118.pdf In PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16306519986kts.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/mununofamezabijapes.pdfIn PDF document text
    • https://titishop.co/upload/files/rabak.pdfIn PDF document text
    • http://grimastone.ru/files/sizetu.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/pebiragutaxogurarowugepa.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6d5rs8bnl21k0cfa5e2tsclv0a/xujopavonagorosojan.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/48466692451.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145561433d5a---luxonudefuvis.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/vumovozevowuk.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/xadajuvinixomavovov.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/97313705058.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/76729158594.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/2mcurllsml4l4np7s7bkl37emg/63727413977.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/74362020703.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0225916997c97d746cbe706e9dd49e06/xidozuj.pdfIn macro / runtime command snippet
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/44251961185.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/23036151883.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/57100241846.pdfIn PDF document text
    • http://synphabase.ch/upload/file/91544200073.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/badujenogarevuketeteme.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/27533920999.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/5382198243.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/80973816668.pdfIn PDF document text
    • https://fleseriuassIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+3d+sex+game+for+androidPDF 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_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 10976 bytes
SHA-256: 51c7dd64f5c5092e81d356eb4516d0dd2981aec86c7f4eba731880ecc02dc065
font_02_sfnt_off00011f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F30 16904 bytes
SHA-256: 80dfdd1adfd32278a548666680ff64cf33c05669b3d59a87ff94570bb3139994

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