Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc11877a5954f1b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 01:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f5d1dd231f51d5ea6c74a63d319e904 SHA-1: 646a4507077586d26c13bd385b5312f53a5123bf SHA-256: 7fc11877a5954f1bafd25ad7d6f4b6f54c0d6992656d10dc19be1a28c2960466
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://chcial.ru/uplcv?utm_term=download+tft+mobile+apk PDF link annotation
    • https://zohopin.com/calisma2/files/uploads/torus.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/dijewijanovekumulefarutut.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/pixidapitigikezid.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/34152457861.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/58887001802.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/71b9e7ed2550733a41de38e5dfdea07c/vaxesidafiwaret.pdfIn PDF document text
    • http://sns.hu/_user/file/navidupokatuzipiwu.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/vafunemefoziz.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2c529a52fbe6cb6c09eb273eb7ca669b/samojumaputuv.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75558211514.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6988b60b736074ad9743a85eb4fd4348/42776509700.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/batesuwezasinupapoxirowol.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109161007348759.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/konavupapaletafasekonisez.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e0175ffbde40d53f4bf4458c8d22b367/jefanewurobebodadated.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b839da3f90890f7b05fd2ea3aea7eaca/dezegagegosipug.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/82458658485.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328fca8de08---73238799193.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/64482212266.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/fubemuvelexurovanar.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/85989536600.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39324669412.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/murafuf.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7d75036718a80b09b68fe964f5d4e840/14459400919.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/98281810916.pdfIn PDF document text
    • 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_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 17376 bytes
SHA-256: 8ae9eea5166d30e66c0603c3e7cc7ad55a40dc16f453c4fb93487fcbdff073e6
font_01_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001108c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 10708 bytes
SHA-256: 9c25ed7d30e4f58047589d0444b7d3bc10307658ce3845d32bfb65dbb37b1708

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