Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de7a3683d317019…

MALICIOUS

PDF

69.3 KB Created: 2021-09-05 02:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67bf94928d8544d11197604e7cd4d854 SHA-1: a36865215dd9be64a3dfcbc67f1bf53eed63a708 SHA-256: 0de7a3683d3170198a25ffb781a421fa23f2b0ff70c152b44f4d0766b1afff78
126 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to multiple websites, many of which are hosted on compromised CMS platforms or disposable domains. This behavior is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious sites. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4649

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://romanakladatelstvi.cz/userfiles/file/muniropugubevojas.pdf In PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/91000779279.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/9025124097.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/82e26ptrhnfbrg97fln4qqfdm6/16836206939.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/naduzapejekelijo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e65808089b---xalilupijamamogoruba.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ipqdumo1k653stsvsvuh6ru9a6/simivokopukidujuxanilemer.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/pemojinojevukibul.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/poxelimifaxov.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/lirogavij.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/dosuvujusaxonaluzukarif.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/bulebad.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d68b9348---27150973428.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/51570188697.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/aormnki6p918hjngd6e43hvfc3/5085312671.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210725162637_598521681.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/2025239059.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/18490148059.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/5903809290.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d93d9235022e7f0fe5454378833c2874/juweluj.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/60064571172.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d429d7102aa---vareroziwemejujitilawe.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/25058642037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=accounting+process+zenaida+vera+cruz+manuel+pdfPDF link annotation
    • 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_off0000b651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE63 16732 bytes
SHA-256: 5f25c00e614868a830d9f19a8e5be2b0c8a2d8304aaa6c052945ad5659f30916
font_02_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 11168 bytes
SHA-256: f3cbdbb927283a19eab54c1082d9164120a104af0326eac59d65d5999e4acb13