PDF malware analysis — malicious · 888c8b1d0455e502

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 05:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: ad56bb465be1bb60292cd3e1eb0adbdf SHA-1: 5fb27ccf697e1c039906e2c3e9194be19d1c650a SHA-256: 888c8b1d0455e5022be27965f9a695a99fcf9c18341abd53a68261bafa0111a3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on compromised CMS uploads. While no executable scripts were extracted, the PDF structure and numerous embedded URLs suggest it is designed to lure users to potentially malicious content or download further stages. The presence of multiple links to compromised WordPress sites and disposable hosting points towards a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://truhlarstvi-strakonice.cz/files/file/xezitebusuxoganimabujejo.pdf In PDF document text
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1f3c7abde---77504916549.pdfIn PDF document text
- https://aptitudeclass.com/ckfinder/userfiles/files/donaxisuwovavuviwad.pdfIn PDF document text
- https://coverline.ro/userfiles/file/82088755976.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321efbb0d5f---favetufulubesamofasono.pdfIn PDF document text
- http://marketypik.pl/zdjecia/fck/file/kixodemisemex.pdfIn PDF document text
- http://nwhouse.ru/uploads/file/rafiba.pdfIn PDF document text
- https://steammining.com/userfiles/file/madigazunitolanuj.pdfIn PDF document text
- https://akilanews.com/ckfinder/userfiles/files/tovezufajimafisatoret.pdfIn PDF document text
- https://plentis.eu/ckfinder/userfiles/files/81946953443.pdfIn PDF document text
- http://www.offshoreyachts.net/web_upload/editor/files/35279807272.pdfIn PDF document text
- http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210902_214932.pdfIn PDF document text
- http://perseverance.cyou/updatefiles/file/tizeluboz.pdfIn PDF document text
- http://marikitaberbagi.com/userfiles/file/xumagune.pdfIn PDF document text
- https://kattliv.com/kattliv/admin/userfiles/file/xapanusudowejisef.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa73d67916---dilojuwum.pdfIn PDF document text
- http://alfavs.eu/userfiles/file/tozezolinibo.pdfIn PDF document text
- http://cantinachitarra.it/userfiles/file/3940142212.pdfIn PDF document text
- http://fuzoku-kyujin.jp/ckfinder/userfiles/files/62621240411.pdfIn PDF document text
- http://kapalishakti.com/ckfinder/userfiles/files/23455160237.pdfIn PDF document text
- https://812423.qqtogeljackpot2.com/contents/files/37869284336.pdfIn PDF document text
- http://acudrved.com/ckfinder/userfiles/files/lujigat.pdfIn PDF document text
- http://beverly.kopanramen.com/uploads/files/lulodezamotir.pdfIn PDF document text
- https://pakianco.ir/data/image/uploads/news/files/sodomafulas.pdfIn PDF document text
- http://atlonnuri.org/UpLoadImage/editer/files/xedawefofu.pdfIn PDF document text
- http://www.jobsincrete.gr/images/_user_na/file/boraxufekozelifobewefufan.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=exploration+pro+mod+apkPDF 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_off0000d2d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2D0	19504 bytes
SHA-256: `f77cccc22a15335b6e9d43b2257aa2a73e24720acb3d54f43c054262b15bfe4a`
`font_01_sfnt_off000104fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104FE	10428 bytes
SHA-256: `306927cce04f4ab89fa1d579e09211e03480112b77d608a556a66beca1033317`
`font_02_sfnt_off00011c88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C88	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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