Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba881a6c13cc17e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 02:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 679abf41ffc780c0b6a0177be835ab00 SHA-1: 2ba2af6cad4caa80380a4011c25ddf617c39c5c0 SHA-256: bba881a6c13cc17e09f50a1d4999b208426bb6046366fe9dfeeea96332e68280
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and link farm characteristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://bidhichand.org/sahodyatarntaran/userfiles/file/45153555040.pdf In PDF document text
    • http://iranjobex.com/cache/fck_files/file/tabogagabuxatugewaxadegez.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c107b3b537e---30339756533.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/52417231244.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfe7a3f07f---daxakax.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/9768279514.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/41531488389.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5d74a79fdffccecf4ac655125a5973f0/lijowumisiwafimi.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/45422808244.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/dalegotaramiw.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607633974692f---96061566763.pdfIn PDF document text
    • https://emenu.hu/editor_up/zabigoweloretenigigum.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/xukopelemutitapikegoge.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/rizaro.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/tinixog.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/31180086955.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609843cb7fa91---19506686599.pdfIn PDF document text
    • https://trexanh.net/upload/files/48863695755.pdfIn PDF document text
    • http://bscartridge.com/pic/rasaxirumavefelin.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/vimaneduruvanixuvuwo.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/gozowisewofadijid.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/b83f98412e6d6a96fe8ae7c1d4882bef/9142477367.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34346b2f9c---xekupegavobolototaji.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/vuzokesufelu.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/7120702313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=khutbah+singkat+idul+fitri+pdfPDF 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_off0000c60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 19132 bytes
SHA-256: ba1f75f90072f79f8815e94e9989fa85ad8cbb0783b18de0aa961f09b0506763
font_02_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 10848 bytes
SHA-256: c85b5073cfa6b643ec46be5dd33480863176ccebb1fb33676333d98102a324be