PDF malware analysis — malicious · 87eb8cf2d0c534c0

MALICIOUS

PDF

84.2 KB Created: 2021-07-20 21:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: cd90a267d019fd48bdf03fd0a4bee9bd SHA-1: ff73692a8b66266bd76b4e9e8ceb12951b8d6eb5 SHA-256: 87eb8cf2d0c534c0f0ccc4139eaf0df65380e3d5fe01a40bd6744e5d218c219c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to lure users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://wooshin.kr/uploaded/file/201912058360e4ebe7db821.pdf In PDF document text
- https://mmszke.hu/files/file/73033424743.pdfIn PDF document text
- http://modnyi-buket.ru/uploads/files/difovi.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c3ad32496---95941781487.pdfIn PDF document text
- https://alutat.com/data/file/xasutiga.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6aecedd1075aec12a9cba23ecf6ce483/31365505269.pdfIn PDF document text
- https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8f9a5d76e98692adff474e41971ef11b/85666779896.pdfIn PDF document text
- https://babamore.com/upload/ckfinder_temp/files/20210531161415.pdfIn PDF document text
- http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86d3a60042---xojawuzizuvawozod.pdfIn PDF document text
- https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b24255f01f19bf3f88436134da023d83/77052093999.pdfIn PDF document text
- http://merwepizza.com/upload/file/28060921052.pdfIn PDF document text
- https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/nf97gj6l55v6i5o6uohoofo3h5/buzerupilewarixupod.pdfIn PDF document text
- http://neurooperations.com/ckfinder/userfiles/files/91939877297.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d6744f50---71325993878.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c43238ca00c---6694272121.pdfIn PDF document text
- https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/af7866rer1jq9kjdsmq4tjg3f3/83934701760.pdfIn PDF document text
- http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8d2b1d2f---xitigowamudisawadajawaro.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1bae490f---gareruzinobafeluke.pdfIn PDF document text
- http://greenlivinggarden.com/htdocs/UserFiles/file/33314908355.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/56774629987.pdfIn PDF document text
- http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/porajov.pdfIn PDF document text
- https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160986d54308bc---sutepelas.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608091ec6fb1d---wejaxiregekefubufeweku.pdfIn PDF document text
- https://demetraproject.eu/ckfinder/userfiles/files/ruzuvosa.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0f062a3d998bd2f09e85eb8ec9cc529a/10161943833.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=jump+shot+exercisePDF 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_off0000e58a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE58A	10520 bytes
SHA-256: `f1dc145b747f6cb37e417b8d6c8724c276399ea39ff2e2fac35b8968d43557c0`
`font_01_sfnt_off0000fd8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD8F	17076 bytes
SHA-256: `8974a92c8cc75524c0f8931263e5d60513699b91565ce8b74ef7e75643ea8f5f`
`font_02_sfnt_off00012a06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A06	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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