PDF malware analysis — malicious · 356e72662b50c892

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 07:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: fc1ec36bc2af151ae7c639410e1636ef SHA-1: 22bada94df62e5bda283050bab5bdf787be7a992 SHA-256: 356e72662b50c8924cdb7130922f61ebe846aa19b0ecf2e3e54a25542270023f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple unknown URLs hosted on compromised CMS uploads, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interaction via malicious URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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 http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134343ff2a34---26341081284.pdf In PDF document text
- http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/55208882369.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c4ab37167c1935650198a3b1051d93f1/tokimesizuvilujoniw.pdfIn PDF document text
- http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d46028466---refodixus.pdfIn PDF document text
- http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16083663ba2d34---fofoba.pdfIn PDF document text
- http://kamkmori.cz/ckfinder/userfiles/files/90103250176.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161203a95ae423---13716632206.pdfIn PDF document text
- https://stijsr.com/userfiles/file/25018113519.pdfIn PDF document text
- https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c0b8f3d7bae1c00dbd1dcaa21d32f866/98205684838.pdfIn PDF document text
- http://learnazia.com/fck/imagesfile/22269657043.pdfIn PDF document text
- http://osoboebludo.com/ckfinder/userfiles/files/15250346308.pdfIn PDF document text
- http://premiumtrade.ro/ckfinder/userfiles/files/46146334610.pdfIn PDF document text
- https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/776a26b8e430d7f12f54308b9c59c758/ruposefirebikugemipefoza.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2cf7b3cea---27335953554.pdfIn PDF document text
- http://prosquash.by/data/sunojosenepagijevozof.pdfIn PDF document text
- http://www.supair-lux.hu/ckfinder/userfiles/files/sifazirawijibugerapa.pdfIn PDF document text
- https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/6din4agnp97psfu2vaq6ec0ace/29915328508.pdfIn PDF document text
- http://michellesmithscott.com/clients/36670/File/86648973040.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c94248c281---2121728188.pdfIn PDF document text
- https://intrigantka.ru/images/userfiles/file/lesukidutukojotakiwus.pdfIn PDF document text
- https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16084efeed4e46---puremo.pdfIn PDF document text
- http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/gifanavelewutob.pdfIn PDF document text
- http://apartmaji-zunicmile.com/uporabnik/file/96215849432.pdfIn PDF document text
- https://laetitiabernard.fr/images/file/xiwonuzasajamajadadi.pdfIn PDF document text
- http://bestpokeya.com/uploads/files/51031021838.pdfIn PDF document text
- http://feriaalainversa.com/uploaded/files/78917638620.pdfIn PDF document text
- http://mfahk.com/upload/files/51474433352.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=atari+stfm+manualPDF 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_off0000e648.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE648	18788 bytes
SHA-256: `ce8101cd566dae2c109fe189a78b1567c28ff293b90542e1a53e6caecd854adf`
`font_01_sfnt_off000117a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117A7	10204 bytes
SHA-256: `bf41a7c9b280c9bde25cbb4269734ac4ca77bbdfb49a7026c156bcb3a5dfc035`
`font_02_sfnt_off00012e73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E73	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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