PDF malware analysis — malicious · b1231c77091fb1f3

MALICIOUS

PDF

94.7 KB Created: 2021-08-14 05:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: a9687623ade929a1cbf42a7e0a43e08c SHA-1: d6b9e3d9c3ce7cc2e56266e75486502c6312afdc SHA-256: b1231c77091fb1f33683e3d120ccd575343536fb437ab3a450dc946826254914

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

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://synerhu.ru/uplcv?utm_term=cuentos+de+valores+para+ni%C3%B1os+de+primaria+pdf+para+imprimir PDF link annotation
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c51607a2---xebiruwetofibapizotip.pdfIn PDF document text
- http://conhantaoankhanh.com/webroot/img/files/87825307962.pdfIn PDF document text
- http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/pujiwemupezaxamovirana.pdfIn PDF document text
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f272bb3e---61240338705.pdfIn PDF document text
- http://fashionflutters.com/ckfinder/userfiles/files/71508463374.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/lj8rd4husn907q3cn715vpqaac/35554757748.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb68c763d88---podajowimasaranojiwid.pdfIn PDF document text
- https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/ac5eb3834e61b63599f388bf3213f4a8/jivatanuwivigifuwazerenib.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094696b4b407---8582639354.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/84eab620556e27f54451ebf4b968a330/dozuzeni.pdfIn PDF document text
- https://caribemed.com/userfiles/file/80459104242.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/8rc08uu94tfcuitn3a48bhdns5/70483680828.pdfIn PDF document text
- https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/a2cb28da5e5a5075ce736c5ec919b01f/60615130611.pdfIn PDF document text
- https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/pucbg80te09c0j6jsngisfuq2d/dopoxasoxokef.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb488c0ea1---2035652738.pdfIn PDF document text
- https://bbdirect.com/ckfinder/userfiles/files/gekulunafowapiji.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092512091299---veresisafimegugelujumane.pdfIn PDF document text
- http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/12461273081.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27a26b256---55139579151.pdfIn PDF document text
- http://theprintfactoryvietnam.com/uploads/files/wizasodopapas.pdfIn PDF document text
- http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/cgd3ktgfeh24n4uq6bsr3rcrh1/5754649830.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/0palrl01btpm5i9aiivi3e16qs/dimagadedili.pdfIn PDF document text
- http://jngf.cn/files/file/3718710486.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5f448f0775503883b7960ffa63e1fa20/75234351732.pdfIn PDF document text
- https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/3k8ttkl5qsa8junvqtf9hb0nc0/fasogomamese.pdfIn PDF document text
- http://agataklimowska.pl/userfiles/file/najuvujisizikuvo.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f4c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4C7	11060 bytes
SHA-256: `b32735cfd09b74986dc2c573019dc5615ea968ab73655383d9a4dae1a6a5161c`
`font_01_sfnt_off00010e53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E53	16312 bytes
SHA-256: `7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae`
`font_02_sfnt_off0001245e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1245E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00013c70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C70	17916 bytes
SHA-256: `4d5757f31d29e570a21b7d131f56f713b2a3a56440915d3d1ad737e057b7bc4b`

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