PDF malware analysis — malicious · e563ded1da38c467

MALICIOUS

PDF

96.9 KB Created: 2021-07-06 07:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 4cdb3f9129f906b8a51f5173036fd233 SHA-1: 188ca44155de07000fcdf1950a65c2987c9fa1ed SHA-256: e563ded1da38c467951c1e5874ecbc6098bd43a61b850ef9aef7b7c3decd9938

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF contains multiple links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. ClamAV detection and ML classification confirm its malicious nature. The presence of numerous external URIs and the PDF_RANDOM_URL_LINK heuristic suggest an attempt to obscure the final destination, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9820

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e5090c05---97864734322.pdf In PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d710b5492d---sajupaparuf.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d81b9606f---vunasikinekuz.pdfIn PDF document text
- https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/0c7a2q37gsq56o8uj04ie3pt9n/livuniru.pdfIn PDF document text
- https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/vs44p6htceut7fdgpjk6lndnv3/dorivapovagitok.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b79da33f9---wuvenifavopilanadulevuno.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf1a462a0---petufijipoza.pdfIn PDF document text
- http://raffaelecavazzoni.com/userfiles/files/puxesewotejifo.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160808474849e4---xamosopisofawon.pdfIn PDF document text
- https://windfreeklima.com/upload/ckfinder/files/77852631868.pdfIn PDF document text
- http://worldnaturalfood.com/image/upload/File/39373658815.pdfIn PDF document text
- http://ecandrychow.pl/Image/files/19328281982.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607554d636479---1904467296.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0a5b157e28af24b417d58164f8d79dd5/57647290934.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077e4cf0f85c---ximebazatusawozixof.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9307af8306fc009b3272c3ab8664e3ae/92148644222.pdfIn PDF document text
- http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160832618d4a75---60682821790.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/84b8ac5da30f6176aa15c646a67f975c/4718137281.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7768134547---febojuluxafenevewenopuvi.pdfIn PDF document text
- http://brucemaymemorialgolftournament.com/clients/d/d2/d245e0393a5bbb16d67b82808c007790/File/63099435857.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c9b1c2ed9---39172219683.pdfIn PDF document text
- http://diamantina-joaillerie.com/ckfinder/userfiles/files/4082620098.pdfIn PDF document text
- https://audreyheselmans.com/_files/file/rilebuvefexerigegogaki.pdfIn PDF document text
- http://hotstamping.pl/files/file/31906039238.pdfIn PDF document text
- http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fb08177b7---pizavegorozexoxajix.pdfIn PDF document text
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/bccba40e227d166a1d207533f04c7141/wetivaxelakaladekapupod.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=spiritual+gifts+test+for+youth+printablePDF 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_off00011586.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11586	17756 bytes
SHA-256: `55470694106ae72d5cfa0c7d8d10983a034e4ea9ccee88a0e1da143a2ac97dfa`
`font_01_sfnt_off00014454.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14454	11064 bytes
SHA-256: `e5f59fe11869f64e8eaf915245e9cd613347c4440ec74efa65a8a6db53f6c031`
`font_02_sfnt_off00015ddc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15DDC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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