PDF malware analysis — malicious · 84a2571006dc8276

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 01:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: e4e77033799fbc3c7e5e2b080471edef SHA-1: 3e878e09920fb83c36cd5714f704d89f1c250cb5 SHA-256: 84a2571006dc82765900d9083c62103179737109f57f13b8530c2d6f22aa06ef

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely serving as a distribution point for phishing or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting its role in malicious distribution. No scripts were extracted, but the structure suggests a phishing or malware delivery lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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 https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/68d630ee12a7a06b465107a8751fdc68/pubaterefapevoz.pdf In PDF document text
- https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/fmabf3m2fpuo1lpku42f4195sm/1344090165.pdfIn PDF document text
- http://vigova.com/Images_upload/files/soroponowixigokosaweleta.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae338a97e---jegodunimiwojamup.pdfIn PDF document text
- https://yingzhaoliuart.com/upload/file/53735764445.pdfIn PDF document text
- https://deniz-sogutma.org/img/userfiles/file/74684992535.pdfIn PDF document text
- http://studioarchoggianiepartners.it/userfiles/files/zodabavagu.pdfIn PDF document text
- https://betenagro.com/sites/default/files/file/taguvubur.pdfIn PDF document text
- http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuwojexupozerimeranexo.pdfIn PDF document text
- http://teormech.ru/teormech/usrimg/file/7461032671.pdfIn PDF document text
- https://helices-evra.com/userfiles/file/75878229787.pdfIn PDF document text
- http://xn--3e0b556bhrbowi6undva.com/ckupload/files/vizikuponuremikiwagepeki.pdfIn PDF document text
- https://adverto.ee/userfiles/file/nefusoxedesamogojupedese.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f01734d2f---61173710018.pdfIn PDF document text
- http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7eb81f0cb---11125259613.pdfIn PDF document text
- http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa7a909f83---9001073031.pdfIn PDF document text
- http://kcde.kr/userfiles/file/89884528873.pdfIn PDF document text
- http://historia-bfured.hu/userfiles/file/77648523327.pdfIn PDF document text
- http://opt-russtd.ru/data_center/upload_pictures/file/5274824940.pdfIn PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8dd16c21594cabc5088baf7d7f2a8d4/75638695828.pdfIn PDF document text
- http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce85db93537---banesoruxafuze.pdfIn PDF document text
- http://abacusnancy.com/userfiles/file/nofagafufesiroxale.pdfIn PDF document text
- https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/0399cf6d9762696bed3ef7343ee7c046/pesevewuzuloj.pdfIn PDF document text
- https://suma.ca/upload/editor/file/63756114460.pdfIn PDF document text
- https://anfauglir.com/images/file/22632384638.pdfIn PDF document text
- https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4c37bab9---kazijojifurimoxuzufujuvu.pdfIn PDF document text
- http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b2307f767ffba524536eec64309af12d/bopejonubixijisemamipuxes.pdfIn PDF document text
- https://pindimana.in/uploads/file/49429739148.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=history+of+courts+in+india+pdfPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e085.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE085	17972 bytes
SHA-256: `f1a278ef1acf70e90e571588aa9438d80ece67e111d6140eb2ef8cbfd7792dc3`
`font_01_sfnt_off00010d6c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D6C	10640 bytes
SHA-256: `143bacb0069c38de6a2840c5d734d3808c38d982cbb65cb091604634aa3465d7`
`font_02_sfnt_off000125ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125EF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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