PDF malware analysis — malicious · 071770352b49e7cf

MALICIOUS

PDF

88.9 KB Created: 2021-07-03 03:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: ab75e8b7b347790d06011f7a7bb7fc31 SHA-1: 8b50d9c3d92547291c16c9d13bb3396dfbc64a52 SHA-256: 071770352b49e7cf505ce8e819d9bd3d20246f2af35a005a8d021369529c06a9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to compromised WordPress sites and acting as link farms, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest this document is part of a campaign to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=afk+arena+tier+list+mid+game PDF link annotation
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d8856a9847bf6323172f4b537e6c5e02/28751847760.pdfIn PDF document text
- https://coimbatorepressclub.com/FCKeditor/userfiles/file/mupuzaxidivuzapewineduva.pdfIn PDF document text
- http://bjallstar.com/upload/file/144579978.pdfIn PDF document text
- https://aravlicraft.com/cmsCart//upload/file/murotesesotepasisorexi.pdfIn PDF document text
- http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d5d586743---3198683746.pdfIn PDF document text
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/39fa71052aff0bbb1da0ff9d6747f0f5/fevarojovenama.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/61e8932402d852ec31770a03e98bd750/kekegirawopilowerogaz.pdfIn PDF document text
- https://marwaautorepair.com/nbloom/fckuploads/file/61556577518.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3bcef4bf5763aabd22ccc799a49e08b0/vepilituriligarafowulet.pdfIn PDF document text
- https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/544abc429f06a3a1fa5eb2ac60024f14/nexekupefutigadujavife.pdfIn PDF document text
- https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1817c9b5d---zolagobet.pdfIn PDF document text
- http://littlepearlspublishing.in/data/eimages/file/sudegoxaxofesabagu.pdfIn PDF document text
- http://xn--or3bi2da319p.com/upload/fckeditor/file/43651854292.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b2269205---lugaxedulupir.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607189100496e---40326368094.pdfIn PDF document text
- http://bukharageorgia.com/sites/default/files/file/xijedepakenidumure.pdfIn PDF document text
- https://yptea.com/data/fckeditor/files/6351873985.pdfIn PDF document text
- https://exihomes.com/userfiles/files/79579424148.pdfIn PDF document text
- http://bioterapiazabiegi.pl/obrazy/file/sujegadojeref.pdfIn PDF document text
- http://cga82.com/admin/File/9880695301.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071d496c17b2---26734767319.pdfIn PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a51935d3be27d7d4af5fb50837c0106/tonuxirujugomewulufip.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1768eeaea6ffbc7c69fe17633bc9fee5/64923672633.pdfIn PDF document text
- http://geyikkimya.com/userfiles/upload/file/3009715289.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f97e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF97E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011190.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11190	17156 bytes
SHA-256: `fd5f1f264eeb7247b950184cd33888f0bd772bc08d32cf380983021091490349`
`font_02_sfnt_off00013e6c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E6C	10652 bytes
SHA-256: `ae6594308103f4d497b9273b34bd559de3b03f469dc850ed2ea3118310451ec2`

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