PDF malware analysis — malicious · 20744415af4a199b

MALICIOUS

PDF

85.2 KB Created: 2021-07-21 20:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: 14cfea45175cc03e6887da193e429f99 SHA-1: 1e5ae76cb301babdae1ffeddbf0ad61c65846333 SHA-256: 20744415af4a199b837fba07634414b8a734284bfa152f4004bc7aeaf3eeb1f6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised websites, and a machine learning classifier identified it as malicious. The presence of numerous external URIs, many hosted on disposable or compromised domains, strongly suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure indicates a malicious intent to leverage external links.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://dxczx.com/ckfinder/userfiles/files/20210610_131918.pdf In PDF document text
- https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6f23fe16ab31571608c705f965fab521/36753885702.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f487756ff6a---86593578313.pdfIn PDF document text
- http://africa-emergence2019.com/userfiles/file/81519482422.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42b218628---78877221573.pdfIn PDF document text
- http://king-ber.com/UploadFiles/file/20210704085451851.pdfIn PDF document text
- http://deborahbrown.us/clients/860103/File/basatutive.pdfIn PDF document text
- https://jagamimpi.com/contents//files/46784758336.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d026cc4e---75767659237.pdfIn PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8fb9380f2---vafelejufax.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/da0336a0958fb0f50c1671c5b9206995/xadazab.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77ec02d93---30257613401.pdfIn PDF document text
- https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e05e5aaee8ae2c407fd22b06c3a3258a/12377758588.pdfIn PDF document text
- https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913467db76c---petuzididadigozukomu.pdfIn PDF document text
- https://ikansambel.com/contents//files/29275353489.pdfIn PDF document text
- http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735f49bf837---surigomaxulonijox.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf0ed732d---66069384428.pdfIn PDF document text
- http://etkindenetim.com/resimler/files/ribodutekomos.pdfIn PDF document text
- https://advance-pack.com/editor_upload/file/21664164643.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c797d4c9612---71666321293.pdfIn PDF document text
- https://hagepoorter.be/files/files/85895036006.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf42c71dc7c---fokaruvudikejebofom.pdfIn PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b25d9ee9f---vovolijisogojot.pdfIn PDF document text
- https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/jn6dpufm53bcic4jpgjvge0ab0/nukivanakiles.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/4f3ede852900aaba4903a4afea55e8e1/fegigofarulupidet.pdfIn PDF document text
- http://congtyvima.com/images/Download/nubonijekujadefopelazumo.pdfIn PDF document text
- https://longhoang.vn/upload/files/riwazup.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=golden+hill+state+parkPDF 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_off0000e945.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE945	10620 bytes
SHA-256: `b7c953f68f7467164d0160346e44d1bfd5aabe4c73ae0f5a95bad25636ff994a`
`font_01_sfnt_off00010181.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10181	17300 bytes
SHA-256: `4dac1efd822c3fa0776b24200f89e647c13b71e58e9a9ca901db40e2bddf0d5a`
`font_02_sfnt_off00012f0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F0E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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