Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a66e96db89e5c1…

MALICIOUS

PDF

73.7 KB Created: 2021-09-26 19:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 002e1564074cdf03d102714b9af80134 SHA-1: 2389725e19e356cc65bd3dd60d36a27c123ee0f4 SHA-256: 73a66e96db89e5c1cfe887a7a3100f5b829523edc24ef5a550d03fd98e719760
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://test-immo.com/file/17868655039.pdf In PDF document text
    • http://alibabashipping.com/userfiles/file/93709316549.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/26243129523.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/nuwetofiwegurajisisofo.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/96900233694.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/11334849288.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/wijakosokusewefuxanewujut.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/38640814812.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/33445282358.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/bidukememu.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/65695710871.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf0595fa7---jojiz.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/ruvilujoxesurose.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/safuboloreturaza.pdfIn PDF document text
    • http://cartopack.be/Images/file/farinusoba.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/zitufatukame.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/ropenojewumip.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/5782c97ce35adb168d93c7cd3e681fb7/66494114321.pdfIn PDF document text
    • https://shidoremicrosys.com/media/1104380037.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/famanaxewakitokuve.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/11094731584.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/dokoratetamatovifijowig.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614064764b8d3---zakevukujawusutabegero.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/medalusezewonelivabisor.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/26750400841.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/tejasov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=transfer+app+between+phonesPDF 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_off0000b8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F2 10504 bytes
SHA-256: e86c863d884752b2eb9f952eea7c96a6927b2c12a4c10953653f55a7d880011c
font_01_sfnt_off0000d0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A4 18724 bytes
SHA-256: aef349761466f76671c799ad87694ea86680c7940b8bb9b24ed523e25637d354
font_02_sfnt_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1