PDF malware analysis — malicious · a5d4e4cd2c28b4d7

MALICIOUS

PDF

87.2 KB Created: 2021-06-30 05:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 0e9ef124e1f42b38cc04df1d9dba5307 SHA-1: d696e767801ac2c4a1c1fb4901b73c4c2597e2b2 SHA-256: a5d4e4cd2c28b4d7b3da2cb12064ed36802ac718cf962ea81a6d579edae5f355

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. The presence of embedded URLs and the nature of the link farm suggest it is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://inwebjor.ru/uplcv?utm_term=types+of+apraxia+of+speech PDF link annotation
- https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d64bba92d6602f4c337690ccc99be68f/78512736710.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/61d9123fddce1bbf1a97b7778aac0479/gojojekeguxak.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/sekijojowarovuwonige.pdfIn PDF document text
- http://sugarfree-gelato.com/upload/file/17417394329.pdfIn PDF document text
- https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/7kp1jd6k41je2nlbcfhrtjsttf/jowopumulodikatofageresa.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d3ab387a9---funisadedima.pdfIn PDF document text
- http://happypalettebnb.com/CKEdit/upload/files/taxito.pdfIn PDF document text
- http://uamarkets.com/images/file/26391275502.pdfIn PDF document text
- https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/m48poueppca96875bqe4ht65pq/42352135333.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7712b8d972---nisubefikugezurilewoji.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0967d9af0a---19870565756.pdfIn PDF document text
- http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d455ea4def397bb121633182ff234871/dilizumo.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/98ddb2fc694a40218818e27ebda90a0d/tazafupelewanumixegudil.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2871nlcqogbqrc35rf39547l49/raserupagidotuv.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16097467405bb1---587559128.pdfIn PDF document text
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6bb1889adad19de8bf489db6d164f56f/68320608765.pdfIn PDF document text
- http://www.bash.cl/media/file/81620631575.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b00666f459040cf1d0b45ac192f5a878/36793866472.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jkfvsgl5m0aav632jiip3qevhv/36994761794.pdfIn PDF document text
- http://poorclarescork.ie/images/60250985334.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f0226599---22025894760.pdfIn PDF document text
- https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b9633792b5ce6dd2f3d802d282ea6139/86376677557.pdfIn PDF document text
- https://bbpartner.cz/userfiles/file/20251768233.pdfIn PDF document text
- http://phpirateboosters.com/clients/867602/File/detifefabaruradil.pdfIn PDF document text
- http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/mls02h1tku654n40qc048f8lj7/gufaz.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2d06f91a---zejixiteviwitijuvore.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_off0000f0c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0C0	17596 bytes
SHA-256: `ea5030f5b3bab45b65be178559347b3d54e9ebe1cabd4d6c3761fdbddf1503d1`
`font_01_sfnt_off00011dcc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DCC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000135e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x135E3	10508 bytes
SHA-256: `6d5c5d324ce625e1f95e97a03f6d513f687b5a4e39756c59e2aaacd1ae26f1c6`

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