PDF malware analysis — malicious · ef8f8a31504df8e7

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 15:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 74457aefe58b8f9bdeaae9b3d1f8b239 SHA-1: a933bfa55a55fad6001c50c4b2f66b378037f808 SHA-256: ef8f8a31504df8e7b3f71d96aad0f2add2955e670a95a018cf39ff0743c45e1b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing sites or download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16147c2a263e54---18673393771.pdf In PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5957531a2---dazagarebinefaxuvig.pdfIn PDF document text
- http://refinerlink.com/userfiles/file/dujiwutanuzulune.pdfIn PDF document text
- http://psycare-spb.com/userfiles/file/zaletogi.pdfIn PDF document text
- https://safecampus.in/cmsCart/upload/file/7898898406.pdfIn PDF document text
- http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614430b88ea15---6368479794.pdfIn PDF document text
- http://industra.sk/userfiles/file/31995057498.pdfIn PDF document text
- http://ahnil.com/userData/board/file/19379968843.pdfIn PDF document text
- http://cisseo.net/userfiles/files/11626497555.pdfIn PDF document text
- http://www.luna1956.com/images/library/File/69326213998.pdfIn PDF document text
- http://uitetenindex.nl/images/uploads/98616428559.pdfIn PDF document text
- http://vietsonplastic.com/uploads/userfiles/file/79959456641.pdfIn PDF document text
- http://shengyaweb.com/uploadfile/file/2021090216014942.pdfIn PDF document text
- https://eurotig.ro/file/givenozopixadakigetebos.pdfIn PDF document text
- https://creativitagh.com/pevron/www/img/file/rofiruviziwusotinusalo.pdfIn PDF document text
- http://naszemotyle.natura2000.pl/imgturysta/files/32788411906.pdfIn PDF document text
- http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/netikubino.pdfIn PDF document text
- https://wrd13.com/force/file/gorasozisugoxujene.pdfIn PDF document text
- https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/90c31206d4e83953ca081a9836c1ba65/dafuwuzidotorixufo.pdfIn PDF document text
- https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/92378863339.pdfIn PDF document text
- http://supair-lux.hu/ckfinder/userfiles/files/lalimiguxerenolim.pdfIn PDF document text
- https://0286869143.com/editor_images/files/71893995609.pdfIn PDF document text
- http://jeyadhurgatemple.com/userfiles/file/54098272273.pdfIn PDF document text
- http://retrievers.su/ckfinder/userfiles/files/kabowubarurozi.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130e0fa0ad28---25275342693.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+talking+catPDF 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_off0000def6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEF6	19612 bytes
SHA-256: `40846322d4dbbc6b3eee3b005a3c464fcfcd6dc9ad7b9b0d20979f90bea8fdfe`
`font_01_sfnt_off0001115e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1115E	10320 bytes
SHA-256: `74061a34025f29dc4345a4866a33286920dd39bdc33ed23708eacb55a497e683`
`font_02_sfnt_off00012881.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12881	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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