Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea15934afe202e4…

MALICIOUS

PDF

78.7 KB Created: 2021-06-20 09:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c07f3e661c59e37f8536fe9e16b8e978 SHA-1: ea10f63f42b7a4de78d12581afcdcb30174bc862 SHA-256: 9ea15934afe202e440fc26220dbb12b38508d82640749334662f018d0c5b83eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body, though heavily obfuscated, contains references to 'pubg mobile esp apk download', indicating a lure for users seeking game cheats or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8798

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://beiwendq.com//data/attachment/file/78102547632.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/4ca718684b4d16c6108d957d984e4336/zerafupizukanebiwonatupa.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57aeb2a28---zikuritozivusi.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/xoxebaximijevurejazovaw.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e25567cc5a---vikemev.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607098e1acb31---geres.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/23724328136.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/22402352538.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089150f9add0---ritarabewelapugize.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/o8cn2mmss321hkcfoac075f2nn/doseletutidisi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/03c8ce10ef8d2beff53f92c0e166b4ae/mibagaxovewadidituvit.pdfIn PDF document text
    • http://azizolace.cz/images/file/24485492903.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/bd17af8a8af7bc84df1b4073f665062f/netugoxizareri.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/io2b8nhmbnihniqg7cre9p59gi/gesitomogivaxizuvokuruvi.pdfIn PDF document text
    • http://nfc.soo.jp/file/serelupefurizif.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5a35300c569c183e173bb78771d6c225/14526425861.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/galugitanawobemuwokevowa.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608250e2675a3---4886496078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pubg+mobile+esp+apk+downloadPDF link annotation
    • http://scripts.sil.org/OFLIn 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_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 5480 bytes
SHA-256: c924998264382d5d097b25f0f40c39f7045931e81c68c49472e5191130c2fb36
font_01_sfnt_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 21708 bytes
SHA-256: 298cc5636d67fabffea54810e9df176bd4d59fd3da24b94a6aeb99b8a2351770
font_02_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 16812 bytes
SHA-256: c2f88ad3269028b786f5cfe7604c1be5be27f8451cb813b033ba7a383ff8592f