PDF malware analysis — malicious · 78ec958397b8c4fb

MALICIOUS

PDF

80.9 KB Created: 2021-07-12 22:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 4dfcac46b8b1e2cd87a9affdb70c3a08 SHA-1: 1da1478c110efd9faf864721b8b182223020fae5 SHA-256: 78ec958397b8c4fb2671d5be17f85f4ff54f977f09b8ccffb72424d059a891a1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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 https://synerhu.ru/uplcv?utm_term=coco+and+rum PDF link annotation
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c517e56dfb1---bolejotolugini.pdfIn PDF document text
- https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/higbi8t8jnqihr1721bckq0vb4/bajedido.pdfIn PDF document text
- https://powermailer.in/userfiles/file/47901942432.pdfIn PDF document text
- https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/33155c62be17009ed4e47328070a05a0/kogez.pdfIn PDF document text
- https://iwistw.com/upload/files/poxidogit.pdfIn PDF document text
- http://www.bufolari.com/public/immagini/file/77991279455.pdfIn PDF document text
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd3f345e3c---makuroxurujolidoxomopofi.pdfIn PDF document text
- http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a2ab6689---27658983156.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab01da541b8---94353374892.pdfIn PDF document text
- http://www.dreamstoreonline.es/ckfinder/userfiles/files/buzujiwazefidixamajibiga.pdfIn PDF document text
- http://graviroz.hu/ckfinder/userfiles/files/xabesafolikadadutorafipi.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2r66smggd2nsd5oueabotb0eo7/78595077476.pdfIn PDF document text
- https://plasy.com/uploads/file/36862787213.pdfIn PDF document text
- https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/83369117503.pdfIn PDF document text
- http://alexanderjamesbackcatalogue.com/userfiles/file/foberomulokakeguxare.pdfIn PDF document text
- http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57f9022c1---kezitetugo.pdfIn PDF document text
- http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dfb1bc566---nuxuputip.pdfIn PDF document text
- https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab21969620---jasifuroseza.pdfIn PDF document text
- http://matchedtubes.de/userfiles/file/defefejusofetoko.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609271d550464---bagevanawukovosutax.pdfIn PDF document text
- http://rts-3.ru/upload/files/sorifukejejekevisogose.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d7596236e---digatuvafanukovi.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6ebc221841511de766873c4b85cb2e3e/93220703688.pdfIn PDF document text
- https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/4624bedb0d107b32a4691ed08bc00e34/9220922674.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_off0000d422.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD422	10124 bytes
SHA-256: `22dd07cd41a00ace990fdbac9a39dd1ea3fe900f3d2c5c1b862efbb67c060e35`
`font_01_sfnt_off0000eaa7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAA7	20664 bytes
SHA-256: `7b488084390fe56253ea1a3aa5beb5d1a983ae25ca55e94dc34a31eb225f75f2`
`font_02_sfnt_off00011ec1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EC1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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