PDF malware analysis — malicious · ef03b376dc751e97

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 03:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 4a4767647d7ee5268169f105455ba2a0 SHA-1: 188dd8d51eeb78e93548372f3cbd8d9d199c00bc SHA-256: ef03b376dc751e972c0c8c39b5f920528d3bb26deb6bb0cbeb661e6da1a61502

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's used to host or distribute further malicious content. The presence of multiple PDF_URI entries and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a pattern of redirecting users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0010c3ffb7---11475324438.pdf In PDF document text
- https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/abac9144ae7cf0e30436dd22c2098a8f/8156490522.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/84a6cd95b0325e97d3a5522ef2c48bf1/pemasilowotusenedipusaze.pdfIn PDF document text
- http://elosc.com/upFile/file///ITX202107272323416058.pdfIn PDF document text
- http://nppgursaraijhansi.in/ckfinder/userfiles/files/17122368263.pdfIn PDF document text
- https://espaciocultivarte.com/ckfinder/userfiles/files/5769915501.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cdd66242b5---53182911349.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecc6d0af13---96084613754.pdfIn PDF document text
- http://aromamahabaleshwar.com/ckfinder/userfiles/files/pizakajirovixab.pdfIn PDF document text
- https://nnkcreations.com/userfiles/file/zipebewegipaz.pdfIn PDF document text
- http://toyteepee.com/uploadfiles/file/210823111331789595gtbhrm.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0c391499a4ff42358d0049a544443fec/50927136276.pdfIn PDF document text
- http://iltorg.ru/upload/file/lovazawipakux.pdfIn PDF document text
- https://tonymusic.se/UserFiles/files/pexilozigudekokuzomit.pdfIn PDF document text
- https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/512c94e66ee13c1b737cf8ad69bf5dfa/vipudiwuxofejisuki.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ec6a8716c34dfb32bce28c2a96a71013/suwikakenimumejefa.pdfIn PDF document text
- http://alhouti.com/userfiles/file/68967395873.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a033d9faf6c8990e87f80928ae6b7bae/wirora.pdfIn PDF document text
- http://gwtcs.org/Content/uploads/files/xaxujukozunotexofatupo.pdfIn PDF document text
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/5b7b1d01b235ba403c9366552699372d/80554186886.pdfIn PDF document text
- http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0e2e55aea---nazakonofowobupokajeg.pdfIn PDF document text
- https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a29367ac2d---41451270201.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/b9a39e5145a60be41ab4387d5952e812/wuwijodekolavu.pdfIn PDF document text
- https://bk.knu.ac.kr/ckfinder/userfiles/files/vimifitaboselom.pdfIn PDF document text
- https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086af4a9b2c9---70612844461.pdfIn PDF document text
- http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608723a893be7---9089779078.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=articles+grammar+book+pdfPDF link annotation
- http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/dodilizinuralosonulopa.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e395.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE395	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fbac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBAC	11072 bytes
SHA-256: `be7a1b149e93e715a2ee6a75b929203f4cef32f8e1e110868d95821276635716`
`font_02_sfnt_off0001151e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1151E	17140 bytes
SHA-256: `a61eade79878997d1a3ed56aa73cc90a0097a1a28db7afa09754bfcddbee1f13`

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