PDF malware analysis — malicious · 9ae66d810c5d2e84

MALICIOUS

PDF

90.2 KB Created: 2021-07-02 05:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 010f118f8f7f9fbcf6be71119b93f9e2 SHA-1: 18ee8dae1120a116658dbb0f79ddb03389bb3b51 SHA-256: 9ae66d810c5d2e840f8d835fbe070328e5bdbe851c28171f1352ecd2e83f2f6a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/4e487dfe000419f219338dc2c587cba8/59273188031.pdf In PDF document text
- https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/tpcb3v4bca3bh934qn430qo7b0/83806622195.pdfIn PDF document text
- http://lsbwg.com/ckfinder/userfiles/files/20210614/1706012579.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc94ba8d7---bilevobokiz.pdfIn PDF document text
- http://sugarfree-gelato.com/upload/file/xugijawizediradadozeda.pdfIn PDF document text
- http://www.puhito.hu/uploads/59721768088.pdfIn PDF document text
- http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a1e0b2248f1faac22796a5b86e74f73a/kenuvatifineteloz.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da16845e3addb1056aba19d2a4744599/87570600097.pdfIn PDF document text
- http://kodcomputers.ro/2664/uploads/wasodubasotukaruvenegite.pdfIn PDF document text
- https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fnte951nkglsc99vgiu06pn81h/62667635874.pdfIn PDF document text
- https://principesgs.com/userfiles/file/vofop.pdfIn PDF document text
- https://broodjedenbosch.nl/ckfinder/userfiles/files/muworobemevul.pdfIn PDF document text
- http://kstarsmall.net/userfiles/file///7732146939.pdfIn PDF document text
- https://narimasu-chintai.net/jcfiles/file/mudemalumixolatebeba.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tmf5mlepdbl1u3ed0vv6eppnf4/62204139686.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d40ddde6---5647223161.pdfIn PDF document text
- https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee04e5bd68---lewutegepojekonuza.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082350f483c5---55120229777.pdfIn PDF document text
- http://palami.by/images/file/18949434971.pdfIn PDF document text
- http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb2c1a1fdd---64095407852.pdfIn PDF document text
- http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160925cf3eb039---53986331508.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/k5839p5ogf4hdnt78ch0hbmktf/minisodude.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607870b3a3849---jedutakuxapitowidugosawob.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0c59f43ca626741dec818972c92b516f/76830835321.pdfIn PDF document text
- https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/f6014d0f4080ea41945f87e82c9c247a/kojijofenanezix.pdfIn PDF document text
- https://ctapigroup3.com/contents//files/votokajositulivuxudepof.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=westminster+abbey+is+a+very+bigPDF 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_off0000fd84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD84	10596 bytes
SHA-256: `6ba7169e763b0233469e8ac46e6686db13941debf00989297d4124d2d2942c0b`
`font_01_sfnt_off000115c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115C3	17388 bytes
SHA-256: `f525b213d5258605baee8adf80efc4c8ae718f6cc6129cd1f456322ede395022`
`font_02_sfnt_off00014365.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14365	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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