PDF malware analysis — malicious · 4c28a5ec3bbfd103

MALICIOUS

PDF

70.1 KB Created: 2021-09-20 15:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 34036d9624c1de03d272b0d34fedb779 SHA-1: 4341fd13063970a1683da48d03dd6f5558ba0a9b SHA-256: 4c28a5ec3bbfd103b286a9eae3feaf50590ffd2353ac5e6c95520a825722ac66

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with spearphishing attachments.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139e862ecaaa---dajelifatokuvopi.pdf In PDF document text
- https://thailonghoang.vn/upload/files/94896360637.pdfIn PDF document text
- http://hotel-ambassador-nice.com/upload/files/10516349916.pdfIn PDF document text
- https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c0e4ddc343193233aebe2d66bbd0c3a7/fevafunumirodisa.pdfIn PDF document text
- http://asavn.vn/uploads/userfiles/files/74235169373.pdfIn PDF document text
- https://rajaketiga.com/contents/files/dujarobakuzafa.pdfIn PDF document text
- https://kozlovka.mebel18.com/uploads/files/jozinekisolubabibitif.pdfIn PDF document text
- http://infas.cz/images/wiswig/file/gewavezivufidugemizada.pdfIn PDF document text
- https://anhhuynoithat.com/asset/files/88131161719.pdfIn PDF document text
- https://xn--nmqu14inmf.com/upload/files/99729217679.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b40046cc---83996972608.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/baa29764b832b1cedb52949d848cfe75/rafixugolegusebev.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec39cc0dfb---4552430603.pdfIn PDF document text
- https://sportsht.com/userfiles/file/78551259516.pdfIn PDF document text
- http://tuclubcr.com/campannas/file/dudepawenudizogopo.pdfIn PDF document text
- http://etkindenetim.com/resimler/files/vatadume.pdfIn PDF document text
- http://teamtrinity.net/trinitya/file/pijijilaw.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/de255870e74f4e34514c2d821a3d888f/36133022974.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f9b3aaa1b98e838a1ecae00c1d2dcab0/govuzapepojomegokapu.pdfIn PDF document text
- http://schokobrunnen.com/idata/79648284812.pdfIn PDF document text
- https://lbk-ingatlan.hu/uploads/file/dodopug.pdfIn PDF document text
- http://tk-weld.com/images/library/File/nojeru.pdfIn PDF document text
- https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/g6ubob6h1o5jihtec88rvvd3h3/91121270217.pdfIn PDF document text
- https://msiutilities.net/documents/5051410678.pdfIn PDF document text
- http://kieryk.pl/img/userfiles/file/majupufebuwizisa.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614047e0c160a---viminewonamef.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=price+of+fame+season+2PDF 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_off0000b663.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB663	14480 bytes
SHA-256: `933b180fdaf570fed44cd9822a77fb0094dd4877fb54b9ecc62a450cd7c859e5`
`font_01_sfnt_off0000da44.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA44	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f25b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF25B	10476 bytes
SHA-256: `9c099ff0d92d1c7cde8b3f432c2bb0e5a708abceba024674de52595db354be7e`

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