Malicious PDF — malware analysis report

Static analysis result for SHA-256 6777db6a2d6e38aa…

MALICIOUS

PDF

95.6 KB Created: 2021-09-03 19:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f7db5a3d0370b9b968d1a519d932672 SHA-1: 6f3b529fabc0739135ba83abc19d2b1910445c01 SHA-256: 6777db6a2d6e38aab3284cca09db53aee818735f2ee87a89c9f970694ea0c1d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous links to compromised WordPress sites, suggesting it is used to redirect users to phishing or malware hosting sites. The PDF structure and link farm indicate a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/6ecbf2796533326bbd879c223a6f6ea8/46270581708.pdf In PDF document text
    • http://www.saito-ken.jp/userdata/file/bupenil.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/23972814333.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/ripajikorudabumafa.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210716173620.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/29630115905.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16109b9b2862c3---zizuwitenakazobevut.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/28801672223.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fee36a18b---posuwofanixinazotomex.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/tebopizufanokela.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/vugozefe.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/77614614688.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/64514838956.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b330f4c7b1e---tenejetofavawosumubufi.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/weleruviraxuzim.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/vezatulogudot.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/falajusojenifotuwijiwufog.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/cdd48tfi5ki251rc5np2b4kkm0/34316761055.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/xugizufozo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/13nrhf03q2amv9rmhka868k1ne/duxujufe.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/c8fe9224ff00c362df0016605dceeda1/jonazutu.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/siziveparunivisab.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/68435030831.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/losuzazesuru.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079242296037---63533074056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=chicago+manual+of+style+citation+toolPDF 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_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 18704 bytes
SHA-256: 3f3e15e971c269bb8f9cb4136f886552288c499a3150f81cc80379912d15800b
font_01_sfnt_off00013ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BE 10928 bytes
SHA-256: 497054a2da42a3e8f0be2f17c2c4b844c06757f4e811861b0a1aed0b800e7a89