PDF malware analysis — malicious · 8b4b586e58b3d45d

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 01:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: b61ca6d780793087e5b64fb7123ce1d2 SHA-1: d4ccba984fc8a47f48bb4d32c219320987908b20 SHA-256: 8b4b586e58b3d45d665f87ee772e38dec1c68053486ff0e045e9ce73814f1f6c

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 potentially compromised CMS upload directories, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/158b47be0f9f7db9543e854018e222d7/pukadesasunud.pdf In PDF document text
- https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ahmm1kjslj19av7uq20o5md143/rubasoxigijemakodeguj.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd6ab365e---nelovesaxazazugelazozej.pdfIn PDF document text
- http://gagutp.com/sa_upload/userfiles/file/20210529023027.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/929b93ec27663e650cf2eccd1f3326a1/84473027171.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c2fb762de---87590666002.pdfIn PDF document text
- http://tamlaproject.com/userData/board/file/49343769807.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b343a849b22---zirokadonaf.pdfIn PDF document text
- http://hgbs.de/userfiles/file/79686459618.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/girubiwetol.pdfIn PDF document text
- http://coffee33.ru/archive/file/motixujudadijulinolo.pdfIn PDF document text
- https://alshaabcoop.com/userfiles/file/29081460470.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846f5a63185---81318602786.pdfIn PDF document text
- https://cihangirhotel.com/upload/ckfinder/files/wuvixekesene.pdfIn PDF document text
- http://skonasystems.com/userfiles/file/jibaxavugojixip.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42b2d88df0---xizutujixo.pdfIn PDF document text
- https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0160a8fcac---78894453344.pdfIn PDF document text
- https://arte-salon.ru/upload_picture/56835350813.pdfIn PDF document text
- http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb236b6a1c---gijosenefutujavufud.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6bd0ef0203ead16e181565c27c893701/dutolijufawemupejo.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b169f94007---64012935348.pdfIn PDF document text
- http://zimaletto.com/uploads/file/xunoxolukadotorosor.pdfIn PDF document text
- https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bbf2e6f01---fonokubifewuj.pdfIn PDF document text
- https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/h1m8f25afk58rc6hempt2mrbva/69326558770.pdfIn PDF document text
- http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c74b1552f---90141892410.pdfIn PDF document text
- http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068c225fb1---latuvizigepunigimifuf.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b398bc2ab8f46503c96a9a86b4360e35/sibudevudefodorurelanof.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ser+ir+and+ver+imperfectPDF 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_off0000f2a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2A3	10588 bytes
SHA-256: `298d08fa7c96f0e7cc82f3e055779da3f60955a4e87db73bf68145849dcb191d`
`font_01_sfnt_off00010acb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ACB	18508 bytes
SHA-256: `190b6860c5d2bbf11f02c71561e353afe9a26c7558b77b4ddbe3837e06171f90`
`font_02_sfnt_off00013a0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A0F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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