Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa7a0d70c6a6c2d…

MALICIOUS

PDF

75.4 KB Created: 2021-09-11 13:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfcffb6ad74f235689e1803467aec9d5 SHA-1: 4f17a0047b7c5d391d5b4d94d841206b6d74d890 SHA-256: 3aa7a0d70c6a6c2d3972046c30202e94b6f5cabaeced25f7478f0b42e996b884
126 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with many embedded URLs pointing to various websites. Several heuristics indicate that these links are hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2832

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 https://doctornhospital.com/banglanews24/editorsfiles/files/nofivefifopoxekubuvup.pdf In PDF document text
    • http://321eastern-thailand.com/userfiles/files/fabiw.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/81000225834.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/faxemekixaresosuker.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/70866558033.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/84375277410.pdfIn PDF document text
    • https://olterus.com/contents/files/sedejulowi.pdfIn PDF document text
    • http://wamer.org/userfiles/file/texiped.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/tawofaxezubiwidejupo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4c045477592d4d2d8a9f428e97649592/52373072265.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/fesuziwixenege.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/56668401334.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677d6c680e---padufutalo.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/17728077532.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/51891773157.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/fesudedekoraladonir.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385475acb08---99907664254.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/93480777590.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/62177743924.pdfIn PDF document text
    • http://unibox.lv/files/text/26430158231.pdfIn PDF document text
    • http://rhondachem.com/d/files/tedukafasumafasujeliw.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/80875143865.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/46197785626.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/retatos.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210909_2F24BEB38E85DA2E.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+pokemon+go+hackPDF 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_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 10728 bytes
SHA-256: 2b0cbb99a1dde2e59a7dbd1e3b6954f37ea27733c1e5438493a296b0502c04d4
font_01_sfnt_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 18828 bytes
SHA-256: 50510a71b1d127097e3796e7d59911176d6afc80e1ea139570be0cbb94e6c7c0