Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc356ba1bbc304e0…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 03:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13080e42b97601309e7420495a01ef84 SHA-1: 1080e7feeadd5feaa2d122ac424e594de6161d57 SHA-256: bc356ba1bbc304e0243b53b0298b78e71a462fbea2327e9128321c5831f1cbf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm hosted on compromised WordPress sites, indicating a phishing or redirection attempt. ClamAV also detected it as Pdf.Phishing.Trojan. While no scripts were directly extracted, the nature of the link farm suggests an intent to deliver malicious content or lead users to phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141af5e3a301---tupazafukigat.pdf In PDF document text
    • https://luatkhangthai.vn/upload/fck/file/6468838212.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/70778996428.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210901_144BB52D3D9A8C7F.pdfIn PDF document text
    • https://atavio.ru/files/file/lupasuxemapadilijasetu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ikikagufakinel.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/judetakaredu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/5183f4f19460621b717acae5231adda5/kagomebegizuputixodepuxow.pdfIn PDF document text
    • http://snft.ro/media/file/xibutonomifurager.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f40163464a---44105554970.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/menewimiz.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/93706148293.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/76292820979.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/kefedenolezemudirogiri.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/wilununovimu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b540ec8000---jakuvatidi.pdfIn PDF document text
    • http://videocycling.info/files/file/kunotisedakiz.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/bozeru.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/kusowuvefanuzipipi.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/nezazofodilejafa.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/jevixasana.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210909032925.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/dozazobak.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109031405408672.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/nusujulimusuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cloud+app+apkPDF 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_off0000d3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 9916 bytes
SHA-256: 6ede90702509584e56314efa51c5c4c4de996cc0e1096fe55b6d0186b01351d7
font_01_sfnt_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 18456 bytes
SHA-256: 9a7d2c5965c1ec1d0c592037bc9affc05cdcc1e83f961e90dba747c351cf70e4

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