PDF malware analysis — malicious · 3d4afab901f57025

MALICIOUS

PDF

86.0 KB Created: 2021-07-16 04:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: ec3f95fcbbe749e10eb6eb4189574048 SHA-1: d29cf6411c7ab264ff3003d06153e9556bb656b9 SHA-256: 3d4afab901f57025c6d65d6e4cfc18e8d8207ce3d1384d5134e5baa8589101d6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external files, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV detected this as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of multiple PDF files suggests a potential distribution or phishing campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9839

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 http://rubensova16.cz/files/file/6998821568.pdf In PDF document text
- http://archimax.ch/dynamic-images/cms/file/1925250870.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090b19fd27c1---gilexamofob.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaaf7c8c74---ganepuxakosodovoxexizaz.pdfIn PDF document text
- https://szekszardportal.hu/userfiles/file/mogufem.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b5723e286---larukitutuvujemomojadexu.pdfIn PDF document text
- http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8f9b513b511cbb42254d3c9b20f80c00/pizadozisinulavi.pdfIn PDF document text
- https://afmiletisim.com/resimler/files/rudusolivawi.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070155ce69fb---32770206076.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f7df3463---ziwimekutekasuzelox.pdfIn PDF document text
- https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/1766fcb390a7e8e83f5f4d85b33b1bc3/55981662719.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abd19368a27---nuwexowe.pdfIn PDF document text
- http://mprime.net/ckfinder/userfiles/files/vulijowi.pdfIn PDF document text
- https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c8057a36a2637b3769d1e9c8186dd666/gujizamofixajatefefo.pdfIn PDF document text
- http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa259151d33---zijodinevowajas.pdfIn PDF document text
- http://laduses.nl/image/file/33346863158.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608df62b42595---24360293427.pdfIn PDF document text
- http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160784b65c4d68---59596369135.pdfIn PDF document text
- https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3d8b813a8ec8c4d76ef20d505ba3402b/10506628907.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ef4fcefe5170df3993abb485c6b441b3/retuxokixeniverera.pdfIn PDF document text
- http://interel-rus.ru/test/sites/default/files/file/xazunefupibalone.pdfIn PDF document text
- http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90bf98d53e---43883449236.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2f50bc25f---suretepoganibedov.pdfIn PDF document text
- https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ln6gbi8k50vb8cains75vt73md/10013546885.pdfIn PDF document text
- https://watertorens.nl/userfiles/file/jobowokorejukenubebubopi.pdfIn PDF document text
- http://koreanhotpot.com/uploads/files/50695427247.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=imo+app+for+windowsPDF 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_off0000eeaa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEAA	17192 bytes
SHA-256: `0150c7dab4d5ca254b2bdf97c20ba84186c09dfba84a0daf1944c2ed5e2f63bd`
`font_01_sfnt_off00011b2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B2F	10420 bytes
SHA-256: `a59d559ab3b7987c21558a80cd8b358c7f5c7b6c5b9124338a5299c05e25731b`
`font_02_sfnt_off000132c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132C2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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