Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e523aa0a5d26d4…

MALICIOUS

PDF

87.0 KB Created: 2021-06-29 18:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 44687e956e379ce55d492b7b104b441e SHA-1: 95df847642cba7ffd09cf794ad51037b7220f405 SHA-256: 49e523aa0a5d26d44e214d755c27e912d86f0c87fd5bc87e78441c2330756bc5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to exploit users through indirect means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://betalinktech.com/blmedia/file/70489906164.pdf In PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/xatolobe.pdfIn PDF document text
    • https://birudongker.com/contents//files/vozowufunodoxosuga.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/gixatorazatesaxuniguwejid.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/vemujumiliwajirumekekon.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/t4m9sti7ps628dmbcarnvn9os6/dipis.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1fc7501a6e631ea0f361bbb5826c49e3/97892722723.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/25068274741.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4e6d4e72---83213860491.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/gajov.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/04o4jlah6en07vcrvdnif36sie/37164648305.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1b6ucjh12mefduilbha46763ue/78006215162.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d106b9f9db---lukajiminidisajoje.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vigssvdnnn4ejv7udtqsjm02a4/nabexanisetinov.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/84504542720.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ccab316f1---wurutolasojuwarefovetesun.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/82294860057.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab685607f69---zolixegifafapu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b639062d880---39858069938.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2c8dkc72dv0ef1m7qel1bt10kg/vitalopozoxitobi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/lotare.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/f04uoiin23td0cuc1t1h1ppcu5/guzazisebijodazefaxokovu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/834eabbd2c8e9d658308cca9951bd39f/99205390531.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/kikogefazo.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/20445537315.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077014084a01---50942691686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tyronn+lue+and+allen+iversonPDF 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_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 10384 bytes
SHA-256: 21987a1d8938e6f302b5923a47511fa06e05fdf432a4d98077af6e6a5505803a
font_01_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 17388 bytes
SHA-256: ccc873362b932703b1aabc3d311dd44f3c3406e4a4636bd9c6701ee03d2e63e9
font_02_sfnt_off0001369d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1